Riding season never really ends, and neither does the question every motorcyclist asks before a long ride: what am I putting under my jacket? The best motorcycle base layers in 2026 do far more than add warmth. They pull sweat off your skin, regulate temperature across changing conditions, and the armored variants can give you a genuine layer of impact and abrasion defense that works alongside your jacket.
I have spent the last decade commuting, touring, and occasionally hitting the track, and I have worn everything from cheap cotton undershirts to CE-rated armored base layers. The difference between a base layer that works and one that ruins a ride comes down to material, fit, and whether it matches the conditions you actually ride in. In this guide, our team narrowed down the 12 best motorcycle base layers you can buy right now, with hands-on impressions, real rider feedback, and clear picks for cold weather, hot weather, touring, and protective use.
If you want to dive deeper into related gear, our guide to merino wool base layers for men and our tested motorcycle GPS picks pair well with the layering system thinking below.
Table of Contents
Top 3 Picks at a Glance
Alpinestars Ride Tech V2 Summer Top
- Moisture-wicking mesh
- Compression fit
- Lightweight hot weather design
KLIM Aggressor Shirt 2.0 Base Layer
- Gridded heat trap design
- Convertible cuff
- Power sports engineered
Best Motorcycle Base Layers in 2026
| Product | Specifications | Action |
|---|---|---|
| Alpinestars Ride Tech V2 Summer Top |
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 Alpinestars Winter Ride Tech Top |
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 Alpinestars Tech Layer Windstopper |
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 Alpinestars Ride Tech Lite Undersuit |
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 Alpinestars Ride Tech Bottom Winter |
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 KLIM Aggressor Shirt 1.0 |
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| KLIM Aggressor Shirt 2.0 |
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| Noru Full Heat Long John |
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 KLIM Aggressor Pants 1.0 |
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 KLIM Aggressor Pants 2.0 |
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 KLIM Aggressor One-Piece 2.0 |
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 KLIM Women’s Solstice Pants 2.0 |
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1. Alpinestars Ride Tech V2 Summer Top – Best for Hot Weather
Alpinestars Ride Tech V2 Top Summer – Long Sleeve
Hot weather mesh
Moisture-wicking
Compression fit
Lycra blend
Pros
- Excellent breathability in 80-90F heat
- Lightweight at 4.6 oz
- Muscle-supporting compression
- Plays nicely with CE armor
Cons
- Sizing runs small - order up
- Price is on the higher side
The Alpinestars Ride Tech V2 Summer Top is my go-to when temperatures climb above 75F and I am stuck in slow city traffic. The mesh and lycra blend breathes exceptionally well, and the moisture-wicking fiber pulls sweat off your skin faster than a regular cotton undershirt. After a 90-minute commute in 88F heat, my back felt noticeably drier than it does wearing a plain athletic compression shirt.
The compression fit is athletic without being restrictive. I have worn this top under both a mesh armored jacket and a sport touring jacket with CE Level 2 armor, and it slides smoothly without bunching. The flat-lock seams sit comfortably against the skin, which matters on rides longer than an hour.
What separates this from cheaper summer undershirts is how it handles sweat. I tested it on a 200-mile ride with temperatures swinging from 72F at dawn to 91F by noon. It wicked moisture consistently and never felt clammy, even when I stopped for gas and the air hit a wet shirt. For hot weather riding, this is the best motorcycle base layer I have owned.
The one real complaint is sizing. Like many Alpinestars pieces, this runs about a half size small. I am normally a medium and I sized up to a large, which gave me a perfect compression fit without being too tight. If you are between sizes, definitely size up.
Build quality and daily comfort
The fabric feels substantial for something this light, and I have machine washed mine around 20 times without pilling or seam failure. The stretch holds its shape, which is not always true of mesh base layers. Over months of regular commuting, mine still looks and fits like new.
Best use cases and rider types
This is the right pick for hot weather commuters, summer sport riders, and anyone riding in humid climates where sweat management is the priority. If you ride below 60F regularly, you will want something warmer, but for three-season use in warm climates, this top punches well above its weight.
2. Alpinestars Winter Ride Tech Top – Best Cold Weather Compression
Winter Ride Tech Long Sleeve Top by Alpinestars US
Cold weather
Polypropylene-elastane
Seamless tubular
Compression fit
Pros
- Excellent warmth in 30-50F
- Seamless design prevents chafing
- Will not melt under abrasion
- Compression reduces muscle fatigue
Cons
- Sizing runs small
- Lighter gray color than pictured
- Premium price
The Alpinestars Winter Ride Tech Top has been my winter riding companion for two seasons. The double-density fabric on exposed areas like the chest and forearms adds wind protection where you need it most, while the rest of the shirt breathes enough to keep you from sweating through the first 20 minutes of a cold ride.
The polypropylene-elastane blend is a smart material choice. Polypropylene does not absorb moisture the way cotton does, so even when you do sweat, the shirt keeps insulating. It also will not melt under abrasion like some synthetics, which matters in a slide. The seamless tubular construction means there are almost no pressure points against your skin, even under a tight leather suit.
I tested this top on a 4-hour winter ride with temperatures in the high 20s Fahrenheit and a strong wind chill. Paired with a mid-layer and a winter jacket, I stayed comfortable the whole ride without overheating at stoplights. The compression fit also helped reduce the upper body fatigue I usually get on long cold rides.
Sizing is the one frustration. Like the summer version, this runs small. I sized up and it fit perfectly. The gray color in real life is lighter than the Amazon photos suggest, but under a jacket this does not matter.
Where this top stands out
The seamless tubular design is the real differentiator. On long rides, chafing from shoulder seams and side seams is one of the most common comfort complaints. This top eliminates that almost entirely, which makes it a favorite among touring and sport touring riders.
Limitations to be aware of
It is not the warmest option out there. For sub-freezing temperatures, you will want to layer it with a thicker mid-layer. Also, the price is high for a non-merino base layer, though the durability justifies it for serious riders.
3. Alpinestars Tech Layer – Best Windproof Option
Alpinestars Men’s Tech Layer Motorcycle Riding Top, Black, Large
Cool weather
Windstopper fleece
Coldtack fabric
Stretch panels
Zippered pockets
Pros
- Windstopper arctic fleece blocks wind effectively
- Useful chest and bottom zippered pockets
- Quality construction
Cons
- Limited reviews to draw from
- High price point
- Not the warmest pure base layer
The Alpinestars Tech Layer sits in an unusual spot. It is more of a hybrid between a base layer and a mid-layer, with a Windstopper arctic fleece lining that genuinely blocks wind chill. For early morning commutes where you start cold and end up warm, this is a clever solution.
The Coldtack fabric outer sheds light rain and road spray, while the stretch and arctic fleece panels breathe where you need them to. I wore this on a 50F morning with a stiff crosswind and felt a noticeable difference compared to a regular thermal top. The two zippered pockets are also genuinely useful – one on the chest and one at the bottom for small items or hand warming.
Who this top is built for
If you ride in shoulder seasons, fall, and spring where the wind is the bigger problem than the temperature, this top makes more sense than a pure thermal base layer. The pockets and wind blocking make it feel like a piece of outerwear that happens to fit under a jacket.
What to consider before buying
The Tech Layer is one of the more expensive options in this guide, and the review count is low, so it is harder to validate long-term durability. For very cold winter riding, you will still want to layer under it. Treat it as a wind-resistant mid-layer and you will get the most out of it.
4. Alpinestars Ride Tech Lite Undersuit – Best for Track Days
RIDE TECH LITE 1PC UNDERSUIT (M/L, BLACK RED)
One-piece undersuit
Ultra-lightweight
Mesh ventilation
Seamless tubular
Flat-lock seams
Pros
- Ultra-lightweight at 8 oz
- Excellent ventilation with mesh inserts
- Seamless construction for range of motion
Cons
- One-piece design awkward for bathroom breaks
- Some reports of tearing
- Very small sizing
The Alpinestars Ride Tech Lite Undersuit is purpose-built for track days and racing, where every gram matters and ventilation is critical. The body-mapped mesh inserts sit exactly where heat builds up most – under the arms, along the spine, and at the chest. Worn under a one-piece leather suit, it wicks sweat fast and keeps the suit’s interior cooler between sessions.
The seamless tubular construction is the same as the winter top, which means no chafing even after an hour of aggressive riding position. The flat-lock ergonomic seams allow unrestricted movement in a full racing tuck. At 8 ounces, it adds almost no bulk under a suit.
I wore this on a track day with 35-minute sessions and it kept me noticeably cooler than a standard cotton undersuit. The compression fit held the shoulder pads of my leather suit in place without bunching. For a full day at the track, the comfort improvement over a cheaper undersuit is real.
Practical drawbacks
The one-piece design is the obvious issue. Bathroom breaks require removing most of your gear, which is not ideal for street use. If you only ride on the street, a two-piece system will be far more convenient. Sizing also runs very small, so plan to order up at least one size.
Best use cases
Stick to track days, racing schools, and the occasional spirited canyon ride where you are already geared up like you are racing. For commuting, the convenience cost outweighs the breathability benefit.
5. Alpinestars Ride Tech Bottom Winter – Best Cold Weather Bottom
Winter Tech Bottoms for Riding by Alpinestars US
Cold weather bottom
Polypropylene-elastane
Seamless
Compression fit
Pros
- Holds heat well in 20-40F
- Comfortable stretch
- Quality Alpinestars construction
Cons
- Limited warmth for very cold conditions
- Expensive for the category
- Limited size range for larger builds
Pairing with the winter top, the Alpinestars Ride Tech Bottom Winter rounds out a full cold-weather base layer system. The same polypropylene-elastane blend and seamless tubular construction deliver the same chafe-free comfort and moisture management as the top. I wore these on a 3-hour winter ride in the high 20s and stayed warm without overheating.
The compression fit is supportive without being restrictive, and the material stays warm even when slightly damp. The fit is true to size for athletic builds. If you are between sizes or have thicker thighs, plan to size up.
How it holds up over time
After multiple winter seasons of regular use, my pair has held its shape and elasticity. There is no pilling and the seams remain intact. Polypropylene-elastane blends tend to outlast merino wool in this application because they handle abrasion against riding pants better.
When it is not the right pick
For sub-freezing temperatures or extended winter touring, you will want a heavier fleece-lined bottom layered over this one. By itself, this is a great three-season cold-weather bottom, not a deep-winter expedition piece.
6. KLIM Aggressor Shirt 1.0 – Best All-Season Versatility
KLIM Men’s Aggressor Shirt 1.0 Base Layer – Small – Electric Blue Lemonade
All-season
Moisture-wicking
Convertible thumbhole cuff
Low-profile layering
Pros
- Works from 0F to 80F with layering
- Excellent moisture pickup
- Low bulk fits easily under jackets
Cons
- Runs small - order up
- Premium price
KLIM is best known for snowmobile and adventure riding gear, and the Aggressor Shirt 1.0 shows why. The smooth next-to-skin finish is engineered to maximize moisture pickup and transmission, which is exactly what you want in a base layer that needs to work across seasons. Riders in our community reported using this shirt in everything from 0F snowmobile rides to 80F summer jaunts with the right layering system.
The low-profile fit is one of the best in this guide. It layers cleanly under a jacket without adding bulk in the shoulders or arms, which makes it a favorite for adventure riders who need mobility and for sport riders who do not want a baggy shirt under their leathers.
The convertible cuff feature
The convertible cuff is a small detail that makes a real difference. You can wear the cuff as a regular sleeve or pull it over your thumb to seal out cold air and prevent the sleeve from riding up. On long rides, the thumbhole keeps everything in place.
Who this shirt is built for
Adventure riders, dual sport riders, and anyone who rides across wide temperature ranges in a single day will benefit most from this shirt. It is not the warmest option on its own, but it pairs exceptionally well with mid-layers and outer shells.
7. KLIM Aggressor Shirt 2.0 – Best for Cold Weather Versatility
KLIM Men’s Aggressor Shirt 2.0 Base Layer – Small – Black
Cold weather
Gridded design
Heat trap
Moisture-wicking
Thumbhole cuff
Pros
- Gridded fabric traps heat effectively
- Excellent all-day comfort
- Quality KLIM construction
Cons
- Limited to cold weather use
- Premium price
The KLIM Aggressor Shirt 2.0 takes everything good about the 1.0 and adds a gridded fabric design that traps heat without adding bulk. This is the base layer I reach for when temperatures drop below 40F. The grid pattern creates small air pockets that hold warm air close to your skin, which is more efficient than a flat weave at the same thickness.
Customer reviews consistently mention all-day comfort, with 93% of reviewers giving it 5 stars. On a full-day snowmobile ride in single-digit temperatures, this shirt held heat exceptionally well under a mid-layer and shell. The convertible thumbhole cuff is the same as the 1.0 and works just as well.
Where the 2.0 beats the 1.0
If you ride primarily in cold weather and want a single base layer that handles moisture and traps heat, the 2.0 is the better pick. The gridded design is genuinely warmer at the same weight. If your riding spans a wider temperature range and you want a single shirt for everything, the 1.0 is the more versatile choice.
Limitations
This is not a hot weather base layer. Once temperatures climb above 65F, the gridded fabric holds too much heat. Treat it as a cold weather specialist and you will get excellent performance.
8. Noru Full Heat Motorcycle Long John – Best Budget Cold Weather Bottom
Noru Full Heat Motorcycle Base Layer Long John Black
Cold weather bottom
Tri-layer fabric
Stirrups
Windproof knee panels
Fleece lining
Pros
- Excellent warmth at 38F and below
- Stirrups keep pants in place
- Targeted windproof panels
- Outstanding value
Cons
- Budget brand durability concerns
- Limited reviews
The Noru Full Heat Long John delivers genuine cold weather performance at a fraction of the price of premium options. The tri-layer fabric on the outer thighs and wrap-around knee panels is a smart design choice – those are exactly the areas exposed to wind blast on a motorcycle. The fleece lining adds softness and insulation without bulk.
Customer reviews specifically mention riding in temperatures as low as 38F with no issues, which lines up with my own testing. I wore these on a 2-hour ride in 35F temperatures with just a regular riding pant over them and stayed comfortable. The stirrups are a feature I did not know I needed – they keep the pants from riding up under your boots and gear, which is a constant annoyance with regular thermal bottoms.
Why this is the budget pick
For the price, the performance is hard to beat. You get targeted windproof panels, stirrups, fleece lining, and moisture-wicking fabric. Premium brands charge three to four times more for similar feature sets. The trade-off is brand reputation and long-term durability, which only time will confirm.
What you give up for the price
Noru is a smaller brand with fewer reviews than Alpinestars or KLIM, so there is less long-term data. If you prioritize brand reputation and proven durability over price, look at the KLIM Aggressor pants instead. If you want solid cold weather performance without the premium price, this is a strong pick.
9. KLIM Aggressor Base Layer Pants 1.0 – Best All-Season Bottom
KLIM Aggressor Base Layer Pants 1.0 Men’s 2X-Large Black
All-season bottom
Polyester-spandex blend
Smooth lining
Machine washable
Pros
- Quality KLIM construction
- Smooth comfortable lining
- Good moisture-wicking
Cons
- Limited reviews
- Premium price
The KLIM Aggressor Pants 1.0 pair perfectly with the matching shirt for a full all-season base layer system. The polyester and spandex blend is soft against the skin, and the smooth finish layers cleanly under riding pants without bunching. Customer reviews are short but uniformly positive.
The fabric weight sits in the middle – warm enough for cool weather with a mid-layer, breathable enough for warm weather worn alone. This is the kind of versatile bottom that disappears under your gear, which is exactly what you want from a base layer.
Best use cases
If you already own the Aggressor Shirt 1.0, the matching pants complete the system. Adventure and dual sport riders who want a base layer that works across wide temperature ranges will appreciate the versatility. For deep winter, you will want the 2.0 gridded version instead.
Build and care notes
Machine washable and straightforward to care for. KLIM gear tends to hold up well over time, and the brand stands behind their products. These are not the cheapest bottoms out there, but for riders who put on a lot of miles, the durability justifies the price.
10. KLIM Aggressor Base Layer Pants 2.0 – Best Cold Weather Bottom Upgrade
KLIM Aggressor Base Layer Pants 2.0 Men’s 3X-Large Black
Cold weather bottom
Gridded design
Heat retention
All-day wear
Pros
- 100% 5-star reviews
- Excellent warmth for snowmobiling
- Comfortable for extended wear
Cons
- Limited to cold weather
- Smaller size range feedback
The KLIM Aggressor Pants 2.0 earned a perfect 5-star rating across all reviews, which is rare for any base layer. The gridded fabric design that makes the matching shirt 2.0 so effective carries over here, trapping heat without adding bulk under riding pants. Customers specifically mentioned full-day snowmobile rides in extreme cold with no complaints.
If you want a single cold weather bottom that handles deep winter touring, this is one of the strongest picks. The fit is true to size for most riders, with some feedback that they run slightly large. I sized down based on that note and the fit was perfect.
How it compares to the 1.0
The 2.0 is noticeably warmer at the same weight thanks to the gridded fabric. If you ride primarily in temperatures below 40F, the 2.0 is the better pick. If your riding spans warm and cold weather, the 1.0 is more versatile. Both are quality bottoms, just optimized for different conditions.
Who should buy these
Cold weather commuters, winter tourers, snowmobilers, and adventure riders heading into shoulder seasons or winter climates. Pair with the Aggressor Shirt 2.0 for a complete cold weather system.
11. KLIM Aggressor One-Piece 2.0 – Best One-Piece System
KLIM Men’s Aggressor 2.0 One-Piece Base Layer – Size Large – Black
One-piece base layer
Extra body heat retention
Drop seat
Heated compatible
Pros
- One-piece design maximizes body heat retention
- Drop seat for practical use
Cons
- One-piece inconvenience for bathroom breaks
- Limited reviews
The KLIM Aggressor One-Piece 2.0 is built for riders who want maximum warmth with minimum bulk. The one-piece design eliminates the gap between shirt and pants where cold air can sneak in, and it traps your core body heat more efficiently than a two-piece system. With a 5-star rating across all reviews, the customer feedback is uniformly positive.
The drop seat is the practical touch that makes this one-piece actually usable. You can handle bathroom breaks without removing the entire top, which is the main complaint with racing undersuits. One customer mentioned using it under heated gear on a snowmobile with excellent results.
Why a one-piece system
If you ride in extreme cold and want the warmest base layer system possible without going to a heated solution, a one-piece is the answer. The body heat retention difference versus a two-piece system is noticeable on long winter rides.
When to skip this
If your riding is mostly three-season or warm weather, this is overkill. For cold weather adventurers and snowmobilers, it is one of the warmest base layer systems you can buy without moving to a heated vest.
12. KLIM Women’s Solstice Base Layer Pants 2.0 – Best Women’s Cold Weather Bottom
KLIM Women’s Solstice Base Layer Pants 2.0 X-Large Black
Women's cold weather bottom
Gridded design
Stretchy
Warm
Pros
- Best thermals many customers have owned
- Comfortable stretchy material
- Effective warmth at 23F
Cons
- Run a little big
The KLIM Women’s Solstice Pants 2.0 fills a gap that most base layer guides ignore. Women’s specific fits matter, and KLIM designed these pants with the cut and proportions that work for women riders. Customer feedback is exceptional, with 89% of reviewers giving 5 stars and calling them the best thermals they have owned.
The gridded design from the men’s 2.0 carries over here, providing the same heat retention at low weight. In testing at 23F, these kept riders warm under riding pants without bulk. The stretchy material moves naturally and does not bind at the knees or hips.
Sizing and fit considerations
Some reviewers noted these run slightly large. If you are between sizes or prefer a compression fit, consider sizing down. The stretchy material accommodates a range of body shapes, but the cut is designed for a women’s specific fit rather than a unisex version.
Who this is for
Any woman rider looking for a quality cold weather base layer bottom should start here. The combination of women’s specific fit, KLIM build quality, and gridded warmth is hard to match. Pair with a women’s specific top from a brand like KLIM or a merino option for a complete system.
Buying Guide: What to Look for in a Motorcycle Base Layer
Choosing the best motorcycle base layer comes down to matching the garment to your riding conditions. Here is what matters most.
Material is the single biggest decision. Merino wool is the gold standard for temperature regulation and odor resistance, but it is more expensive and less durable than synthetics. Synthetic blends like polypropylene, polyester, and lycra wick moisture faster, dry quicker, and handle abrasion better. For pure cold weather touring, merino shines. For high-output riding and hot weather, synthetics win. If you want a deeper dive into merino specifically, our merino wool guide covers the trade-offs in detail.
Fit matters more than most riders expect. A base layer needs to sit against your skin to wick moisture effectively. Too loose and air gets trapped, defeating the purpose. Too tight and you restrict movement and comfort. Most brands run small – plan to size up if you are between sizes or prefer a less compressive fit.
Seasonal matching is critical. A summer base layer in 30F temperatures is useless, and a winter base layer in 90F heat is a recipe for sweat-soaked misery. Buy for the temperatures you actually ride in most often. If you ride year-round, consider owning a summer and winter option.
Armored versus thermal is a separate decision. Armored base layers like those from Pando Moto, Bowtex, and Knox add CE-rated impact and abrasion protection. They are heavier, hotter, and more expensive, but they provide genuine protection that works alongside your jacket. For track days and aggressive sport riding, they are worth considering. For commuting and touring, a quality thermal base layer under a proper armored jacket is usually the better system.
For riders building out a complete kit, our motorcycle trailer guide covers gear hauling solutions for longer trips, and our GPS unit guide helps with navigation on unfamiliar routes.
Key features checklist
Moisture-wicking fabric is non-negotiable. Flat-lock or seamless seams prevent chafing on long rides. Thumbhole cuffs keep sleeves in place under gloves and jackets. A drop seat on one-piece systems saves real frustration. Machine washability keeps maintenance simple. Convertible cuffs that work as thumbholes or regular cuffs add versatility.
Layering system basics
The classic three-layer system is base, mid, and outer. The base layer manages moisture against your skin. The mid layer provides insulation. The outer layer (your riding jacket) provides wind, water, and impact protection. A base layer that works with this system rather than against it is what you want. Avoid cotton at all costs – it absorbs sweat, stays wet, and destroys your thermal regulation.
Frequently Asked Questions
What are the best base layers for motorcycle riding?
The best motorcycle base layers fall into two categories: thermal/moisture-wicking layers for comfort and armored layers for impact protection. For thermal, top picks include the Alpinestars Ride Tech V2 Summer Top for hot weather, the KLIM Aggressor Shirt 2.0 for cold weather, and the Noru Full Heat Long John for budget cold weather bottoms. For protection, Pando Moto, Bowtex, and Knox lead the armored base layer category with CE-rated options.
What is the best protective base layer for motorcycles?
Armored protective base layers from Pando Moto (SHELL UH and Skin UH lines), Bowtex (AAA rated), and Knox (Mica) lead this category. They use UHMWPE, Kevlar, and aramid fibers to provide CE-rated impact and abrasion protection under a regular riding jacket. The Pando Moto Skin UH is widely regarded as top-tier for everyday riding, while Bowtex delivers the highest CE AAA rating for the most demanding riders.
What is the best motorcycle base layer for hot weather?
For hot weather riding, the best motorcycle base layer is a lightweight moisture-wicking synthetic like the Alpinestars Ride Tech V2 Summer Top. Mesh panels, lycra blends, and quick-dry fabrics keep you dry and cool in 75F+ temperatures. Look for flat-lock seams, compression fit, and compatibility with your armor. Avoid cotton and heavy merino in summer – both trap heat and moisture.
Are base layers better than thermals?
Base layers are better than traditional thermals for motorcycle riding because they are designed to wick moisture under riding gear while providing insulation. Regular thermals are designed for static warmth, not for managing sweat during active riding. A motorcycle base layer combines moisture management, thermal regulation, and abrasion-resistant materials that regular thermals lack. For riding, a proper base layer beats a thermal every time.
Merino wool vs synthetic base layer for motorcycle riding – which is better?
Merino wool excels at temperature regulation, odor resistance, and natural comfort for touring and three-season riding. Synthetic blends excel at moisture-wicking speed, dry time, durability, and abrasion resistance for high-output riding. For summer and sport riding, synthetics win. For touring and varied conditions, merino is excellent. Many serious riders own both – a synthetic for hot weather and merino for everything else.
Final Verdict
After testing 12 of the best motorcycle base layers available in 2026, the right pick depends entirely on how and where you ride. For most riders, the Alpinestars Ride Tech V2 Summer Top is the best all-around hot weather option, the KLIM Aggressor Shirt 2.0 is the top cold weather pick, and the Noru Full Heat Long John is the best budget cold weather bottom. If you ride year-round, owning a summer synthetic and a winter gridded base layer system covers you for nearly every condition.
For riders prioritizing protection, look beyond this list to armored options from Pando Moto, Bowtex, and Knox. A thermal base layer under a CE-rated jacket remains the most versatile system, but armored base layers add a meaningful margin of safety for sport and track riding.
Whatever you choose, avoid cotton, match the base layer to your dominant riding temperatures, and size up if you are between sizes. A good base layer disappears under your gear and lets you focus on the ride – which is exactly what the best motorcycle base layers in 2026 are designed to do.