Best Base Layers For Hiking
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If there’s one piece of hiking gear worth spending a little extra on, it’s a good base layer.
When the weather can’t decide what it’s doing, a good base layer keeps you dry and warm from start to finish.
I’ve tried plenty of options over the years and learned firsthand how much the right layer can make a difference. The best base layers for hiking regulate temperature, wick away sweat, and fit easily under a fleece or rain jacket.
With so many options out there, it can be hard to know where to start. These are the base layers that have actually earned a spot in my hiking wardrobe. You’ll find lightweight picks for spring and fall, warmer layers for winter, and a few sun-protective shirts that make long summer days on the trail a lot more manageable.
Let’s take a look at the ones I wear most!
Quick Guide
Most Affordable: REI Lightweight Long-Sleeve (womens) & REI Lightweight Half Zip (mens)
Best Sunshirt: REI Sahara Shade Hoodie – Womens & Mens
Best Lightweight: REI Lightweight Crew Top – Womens & Mens
If you only buy one: Smartwool Classic Thermal – Womens & Mens
Lightweight Base Layers
Perfect for moderate temperatures or high-output hikes, lightweight base layers help you stay cool, dry, and comfortable. These breathable hiking layers wick sweat fast and dry even quicker. Here are a few top picks I always pack when the weather demands a thin layer.
Women’s
REI Co-op Lightweight Base Layer Long-Sleeve Crew Top
I’ve worn this top on everything from crisp fall hikes in North Carolina to early-spring trips out West when mornings started below freezing. It’s soft, stretchy, and sits comfortably under any outer layers without feeling bulky.
What I love most is how it handles sweat. Even on long climbs, it dries quickly and never clings.
Pros
- Breathable and quick-drying
- Stretchy fit that moves easily
- Great value for the quality
Cons
- Runs a little short in the torso
- Not as warm as midweight merino
REI Co-op Lightweight Base Layer Tights
These tights have become my go-to base layer when temperatures dip, but don’t call for full thermals. They sit well under hiking pants with zero bunching, which is rare for a budget pair, and the waistband stays in place even on longer hikes.
They’re lightweight enough for spring and fall but still add an extra layer for when evenings turn cold around camp.
Pros
- Smooth, stay-put fit under pants
- Lightweight but warm enough for chilly days
- Excellent price for the quality
Cons
- Waistband can loosen slightly after several wears
- Not ideal for sub-freezing temps
Other Women’s Base Layers I Like
REI Co-op Lightweight Long-Sleeve Crew Base Layer Top
A reliable, affordable layer I grab for weekend hikes when I don’t want to pack my pricier merino tops.
Patagonia Capilene Cool Daily Long-Sleeve Shirt
Soft, fast-drying, and ideal for hot or humid hikes when you’re expecting to sweat.
Classic All-Season Merino T-Shirt
Light, breathable merino that’s great for warmer weather and handles repeated wear easily.
Men’s
REI Co-op Lightweight Base Layer Long-Sleeve Crew Top
My husband wears this one year-round, usually under a fleece. It’s breathable, soft, and holds its shape even after plenty of washes.
He likes that it keeps him feeling fresh on the move without ever feeling too hot, which makes it an easy layer to grab for any season.
Pros
- Breathable and moisture-wicking
- Works well on its own or under layers
- Age well over time
Cons
- Fit runs slightly slim through the shoulders
- Not ideal for very cold temps
REI Co-op Lightweight Base Layer Bottoms
These are essential hiking items if you’re on the trails a lot. They add a comfortable layer of insulation without bulk, and fit smoothly under hiking pants or snow gear.
Connor has used them for everything from chilly fall mornings to winter hikes, and they’ve lasted really well over the years.
Pros
- Retains enough warmth without overheating
- Perfect to layer under pants
- Great value for the price
Cons
- A little too light for below-freezing days
Other Men’s Base Layers To Try
REI Co-op Lightweight Half-Zip Crew
Adds airflow on more challenging hikes where you will sweat more, and the zip makes it easy to adjust on the go.
Smartwool Classic All-Season Merino Long Sleeve Base Layer Top
Light, odor-resistant, and easy to wear for multiple days in a row.
Midweight Base Layers
Midweight base layers are your go-to for cooler temps, shoulder seasons, or layering in unpredictable weather. They offer more warmth than a lightweight option without adding bulk, making them a key part of any solid hiking layering system. These are the layers I reach for when mornings are chilly but the day might warm up.
Women’s
Icebreaker Merino 200 Oasis Long-Sleeve Crewe
This one will earn its place in your pack every winter just like it did with mine. What makes it stand out is how easily it moves from trail to travel days. The fit looks polished enough to wear out for coffee, but it still performs well on the trail.
The merino keeps your temperature steady and never feels heavy, even when you’re layering up. It’s the kind of top I reach for on trips because it always feels right, no matter what I’m doing that day.
Pros
- Works well for hiking or everyday wear
- Breathable merino that regulates heat naturally
- Durable and odor-resistant
Cons
- Pricier than synthetics
- Needs a little extra care when washing
Icebreaker Merino 200 Oasis Thermal Leggings
These leggings have been part of my winter kit for years because they’re easy to move in, and, even though they’re soft, they never bunch up under hiking pants. Pair them with the long-sleeve and you’ve got a dynamic duo that handles just about any cold day.
The waistband stays put when you’re on the go, and they don’t stretch out after a few wears. These are the kinds of layers I rely on for winter hikes like those in Waynesville or Bryson City, and they’ve stood the test of time alongside the matching top.
Pros
- Moves well during long hikes or climbs
- Stays fresh after multiple wears
- Soft feel that doesn’t lose shape
Cons
- Takes longer to dry than synthetics
- Too light for heavy snow conditions
Other Women’s Base Layers To Look Out For
Patagonia Capilene Midweight Crew
This top is great for those in-between days on the trail when it’s cool one minute and sunny the next.
Smartwool Classic Thermal Merino Base Layer Bottom
These leggings are my go-to for crisp mornings when I want to stay warm without feeling weighed down.
REI Co-op Midweight Long-Sleeve Base Layer Top
An easy, affordable layer that still feels good to wear and often ends up in my pack.
Men’s
REI Co-op Midweight Long-Sleeve Base Layer Top
If you want a layer that keeps up with all types of weather, this one’s a great all-rounder. It fits close enough to wear under jackets but still has the stretch you need for long hikes or setting up camp.
The recycled fabric blend feels soft, dries fast, and even offers UPF 50+ protection — something we’ve learned to appreciate on sunny trails. It’s been through plenty of trips and washes, and it’s still going strong, which says a lot.
Pros
- Works well for layering or wearing on its own
- Quick-drying recycled material with UPF 50+
- Holds up after repeated use
Cons
- Slightly fitted through the shoulders (though this could be a pro depending on preference!)
- Not designed for deep-winter temperatures
Icebreaker 260 Merino Tech Thermal Leggings
These are built for cold days on the trail and long stretches outside. They’re thick enough to stay warm when the wind picks up, yet flexible enough to move easily when you’re hiking or setting up camp.
They’re great under hiking or snow pants and keep their shape trip after trip. If you spend a lot of time outdoors in winter, these are the ones you’ll be glad to have packed.
Pros
- Warm, flexible, and long-lasting
- Odor-resistant merino blend
Cons
- Higher price point (but worth the investment)
- Again, too heavy for milder days
Other Men’s Base Layers to Try
Patagonia Capilene Midweight Crew
Light warmth that keeps you dry and moves easily on active hikes.
Patagonia Capilene Midweight Bottoms
Slightly heavier but versatile for everything from cool mornings to snowy trails.
Smartwool Classic Thermal Merino Base Layer Bottom
Keeps you warm from the first icy step to the last mile of the day.
Heavyweight Base Layers
Hidden because it was super cold
When temps drop below freezing or you’re hiking in snow, heavyweight base layers provide the extra insulation you need. These thicker layers trap heat while still wicking moisture, making them ideal for winter hikes, alpine climbs, or frosty mornings at camp. Below are my top choices for staying warm without overheating.
Women’s
REI Co-op Heavyweight Merino Crew
If you’re heading into some cold, this crew is the one you’ll thank yourself for packing. The merino has enough weight to make a difference, but it still moves easily when you’re hiking or layering up in camp.
I’ve slipped mine under insulated jackets, around the fire, and on snow-camp mornings — it holds its warmth, fits well, and consistently earns a place on hiking or camping trips.
Pros
- Retains heat in very low temperatures
- Maintains shape and comfort after many wears
- Ideal for heavy layering or base-only setups
Cons
- On the heavier side compared to lighter layers
- Pricier than entry-weight options
REI Co-op Heavyweight Merino Base Layer Bottoms
These bottoms are built for the kind of days when the frost is still on the tent and you’re glad you chose merino. They layer under hiking or ski pants without feeling bulky, the waistband stays in place, and they’ve kept their fit trip after trip. I pick them when I know I’ll be working to stay warm.
Pros
- Strong warmth for cold conditions
- Durable through seasons of use
Cons
- Slower drying than other fabrics
- Not great if you’re caught in unexpected warmer temps
Other Women’s Base Layers I Love
Icebreaker 260 Tech Long-Sleeve Crewe
A touch lighter than the Smartwool, but great for cold days when you’re moving more and don’t want to overheat.
Men’s
Icebreaker 260 Tech Long-Sleeve Crewe
If you spend time outdoors when the temperatures really drop, this is the top you’ll reach for again and again. It’s thick and sturdy enough for snow and wind but still feels smooth against the skin.
The merino keeps heat in without getting stuffy, even when you’re layering up or hauling gear. It’s been through plenty of winter trips and still looks as good as the day it came out of the box.
Pros
- Reliable warmth for deep-winter conditions
- Smooth, non-itchy merino
- Holds up well after repeated wear
Cons
- Heavier-feeling than lighter layers
- Comes at a higher price point
REI Co-op Heavyweight Merino Base Layer Bottoms
These are the ones to pack when frost covers the tent and it’s too cold even to hold your coffee without a good set of gloves! They fit comfortably under hiking or ski pants, add instant warmth, and don’t sag or twist after a full day of wear.
The merino blend keeps them from feeling too damp, and they’ve held up through season after season of snow hikes and mountain trips.
Pros
- Excellent heat retention
- Ideal for long, cold days outside
Cons
- Takes a little longer to dry
- Too warm for weather that’s due to get warmer
Other Men’s Base Layers To Love
Arc’teryx Rho Merino Wool Crew Neck Base Layer Top
Made for deep-winter hikes, these feel sturdy, soft, and ready for just about anything cold weather throws your way.
Sunshirts
Women’s
When you think of layering, it’s not just about staying warm, it’s about staying protected from the elements…the sun included!
I always pack this hoodie for hikes where shade is hard to find. It’s light, dries fast, and keeps your skin covered without feeling heavy. The sleeves roll up easily when it cools off, and the hoodie keeps the sun off my scalp/ears.
Pros
- UPF protection for sunny hikes
- Quick-drying and gentle on the skin
- Easy to wear on and off the trail
Cons
- Fit runs slightly roomy (could be a pro depending on what you like!)
- Can wrinkle if packed tightly
Other Women’s UPF Layers to Try
A simple, sun-protective tee that’s a staple for short, sunny hikes.
Built-in UPF protection with a relaxed fit that’s ideal to wear all day.
Patagonia Capilene Cool Daily Hoodie
Cool, fast-drying, and versatile enough for hikes, travel, or water days.
Men’s
When the sun’s beating down, this is the shirt my husband always reaches for. It keeps him covered without feeling stuffy, and the built-in hoodie helps on long, exposed trails.
It dries quickly after a sweaty climb and still looks decent if you wear it straight to lunch.
Pros
- UPF protection for warmer days with little shade
- Fast-drying and easy to layer
- Comfortable fit for active use
Cons
- Fabric can wrinkle after packing
Other Men’s UPF Layers to Try
Patagonia Capilene Cool Daily Hoody
Extra coverage for your neck and head when the sun’s relentless.
A simple, quick-drying tee that’s great for hot-weather hikes.
Thermals
Women’s
Smartwool Classic Thermal Merino Crew
If you’re heading out in true winter weather, this is the top you’ll want close to your skin. It’s thick, reliable, and does an excellent job holding heat when the temperature drops.
The merino still feels gentle against the skin and never takes on that damp chill after a long day outside. It’s the one I pack when I know there’s snow in the forecast or when we’re camping through freezing nights.
Pros
- Excellent insulation for sub-zero temps
- Odor-resistant and durable
- Stays warm even if slightly damp
Cons
- Heavier than other merino layers
- Needs extra care when washing
Smartwool Classic Thermal Merino Base Layer Bottom
These are built for those hikes where you can see your breath before the sun’s even up. They’re light enough to move in but trap plenty of heat, and the inside has a brushed texture that feels cozy on cold mornings.
They dry quickly at camp and are always ready to go again the next morning, making them the perfect addition when you need to pack as little as possible!
Pros
- Great insulation without feeling restrictive
- Soft interior for all-day comfort
- Quick to dry after washing or wear
Cons
- Not as odor-resistant as merino
- Can feel too toasty if the day warms up
Other Women’s Base Layers To Look For
Icebreaker Merino 200 Oasis Thermal Base Layer Leggings
A quick-drying, high-performance layer that’s great for staying warm without feeling bundled up.
Kari Traa Rose Half-Zip Base Layer Top
A fantastic base layer under ski jackets or for sleeping in at camp on cold nights.
Kari Traa Rose High-Waist Base Layer Pants
These keep your legs toasty on freezing mornings and layer easily under snow or hiking pants.
Men’s
Smartwool Classic Thermal Merino Base Layer Crew
This is the kind of layer that earns its keep every winter. It holds warmth when the wind cuts through, but still feels easy to move in, whether you’re hiking, skiing, or just layering up for cold mornings.
The merino keeps things feeling dry and fresh, even after a few wears, which makes it an easy favorite for multi-day trips.
Pros
- Reliable warmth without bulk
- Odor-resistant merino that stays fresh
- Moves comfortably under jackets
Cons
- Takes longer to dry than synthetics
- Can feel heavy if you’re really active
Smartwool Classic Thermal Merino Base Layer Bottom
These bottoms are made for the cold kind of days when you’re crunching through snow and don’t plan on heading inside anytime soon.
The fit feels steady but never tight, and the fabric adds the cold protection you don’t have to think about — it just works. They handle long wear well, stay soft even after washing, and easily earn a place in any winter gear lineup.
Pros
- Lasts through long days
- Soft touch material
- Maintains comfort and quality over time
Cons
- Takes longer to dry than synthetic options
- Too warm for shoulder-season hikes
Other Men’s Base Layers To Consider
Smartwool Classic Thermal Merino Quarter-Zip Base Layer
Great for those full winter days when you want steady warmth that lasts from morning to night.
Icebreaker 260 Merino Tech Thermal Leggings with Fly
The perfect base layer for sleeping in, especially if you have to get up to go during the night.
Icebreaker Merino 260 Tech Long-Sleeve Crewe Thermal Top
A comfortable thermal that’s thick enough to keep you warm, but still breathable.
Smartwool Intraknit Thermal Merino Crew Base Layer Top
These are an easy choice for cold hikes when you need warmth but still want to move freely.
Materials To Consider
What your base layer is made of makes all the difference. Each fabric handles heat, sweat, and odor differently, so it’s worth thinking about where and how you’ll be hiking before you buy.
Merino Wool
You’ll notice merino wool shows up a lot in the heavyweight and thermal sections, and for good reason. It’s soft, naturally odor-resistant, and keeps you warm even when it’s damp.
It also manages temperature better than most fabrics, which is why so many of the colder-weather layers use it. It costs a little more, but if you hike often, it’s one of those investments that pays off trip after trip.
Synthetics (Polyester or Nylon Blends)
If you want something quick-drying, affordable, and simple to wash, synthetics are a great choice. They’re ideal for warm-weather or high-energy hikes where staying dry matters more than insulation.
They can hold onto odors, which makes them not as effective for multi-day trips, but they’re tough and built to last.
Blends
Blended fabrics combine merino’s softness and heat control with the strength and faster drying time of synthetics. If you hike through mixed conditions or want a low-maintenance option, blends are a smart middle ground.
FAQs: Base Layers For Hiking
What is the best base layer for hiking?
A merino wool layer, like the Smartwool Classic Thermal Crew or the Icebreaker 200 Oasis, is ideal for cooler hikes. For warmer days, lighter synthetics such as Patagonia’s Capilene Cool Daily keep you dry without overheating.
What layers should I wear for hiking?
Start with a moisture-wicking base layer like REI’s Lightweight Crew, add a warm midlayer such as a fleece or light puffer, and finish with a shell to block wind or rain. I have a few examples of how to layer hiking gear in my Hiking Outfits for Fall post!
What is the best material for a hiking base layer?
Merino wool is the most reliable year-round since it regulates heat and resists odor. Synthetics are great if you prefer something that dries quickly and is easier to wash.
What is the difference between thermals and base layers?
All thermals are base layers, but not every base layer is a thermal. Thermals are the thicker versions designed for colder weather, while lighter base layers focus more on keeping sweat off your skin.
Both serve the same purpose: keeping you dry and comfortable, but the weight you choose depends on the season and how cold it gets where you’re hiking.
Wrap-Up: Base Layers For Hiking
I’ve learned that the best base layers for hiking are the ones you reach for most often. They do their job so you can enjoy the trail. Once you find a few that fit right and hold up to hundreds of miles, you won’t want to hike without them.
