Icebreaker's versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Long Sleeve Crewe is our best-selling base layer top. This ultra-light shirt is designed to keep you cool in the summer and warm in the winter, offering the perfect temperature regulation.

Icebreaker's versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Long Sleeve Crewe is the best-selling base layer top.

Our best-selling base layer bottoms made from soft and breathable 100% merino wool jersey, the 200 Oasis Leggings are the perfect foundation for your cold-weather layering.

Temperature regulating, itch and odor-resistant, strong thermoregulatory properties, and quick-drying capabilities make them an ideal choice for winter outdoor athletes and off-trail explorers.

A warm, breathable and soft-touch design, this men’s base layer also features ZeroScent technology that naturally reduces odour build-up thanks to its anti-microbial properties.

Designed to meet the demands of alpine pursuits, ergonomically constructed raglan seams maximise your range of motion whilst the ribbed cuffs create a stronger barrier between the elements. A lightweight design with a comfortable crew neck collar means you can make every layer count with this ACTIVE WARM ECO base layer from ODLO.

The ACTIVE WARM ECO KIDS Long-Sleeve base layer top will keep your kids warm and comfortable on any action-packed winter adventure.

With its advanced thermoregulation and soft feel, this multifunctional base layer provides optimal insulation while allowing for a full range of movement. 

Comfortable, considered and eco-friendly, celebrate the future of sustainable sportswear with ODLO’s Women’s ACTIVE WARM ECO Long-Sleeve base layer top.

Crafted from recycled polyester fibres to reduce its carbon footprint, this next generation base layer is ideal for alpine pursuits thanks to its warm and breathable qualities. 

A warmer, midweight version of our best-selling Oasis, the 260 Tech Long Sleeve Crewe is a go-to piece for winter layering, made with 100% merino wool.

The benchmark against which all others are judged, the Merino 200 Oasis Long Sleeve Half Zip features our most versatile merino wool jersey fabric for year-round layering performance across any activity.

Midweight base layer bottoms perfect for skiing, winter hiking, or cold-weather layering, the 260 Tech Leggings are a warmer version of our best-selling Oasis Leggings, made with 100% merino wool.

Meet the new and improved Women's Merino 250 Base Layer Crew.

Smartwool have updated this 100% Merino wool fan-favorite with an enhanced fit to improve functionality while elevating aesthetics. The addition of shoulder panels its flatlock seam construction helps prevent chafing and increases your comfort level.

Add one of Smartwool's best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or biking.

Smartwool have updated the fit of their Men's Classic Thermal Merino Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics.

As one of their heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature regulated as you enjoy high-intensity skiing, hiking, running, and more.

Spring skiing or summer camping?

The Classic All-Season Merino Base Layer Long Sleeve is game for either. With Smartwool's Core Spun technology, they've wrapped lightweight Merino around a nylon core for added durability, while still keeping the comfort of ultra-soft, responsibly-sourced Merino next to skin.

Smartwool added smooth flatlock seams to help minimize chafing and offset shoulder and side seams to lie smoothly beneath pack straps.  No matter the season or the activity, this base layer is made for it.

An all-season favorite, the Classic All-Season Merino Base Layer Long Sleeve can be sported as a base layer in the fall or summer when it's time to go backpacking.

This base layer features Core Spun technology—which features Merino wrapped around a nylon core for added durability while still keeping the comfort of ultra-soft, responsibly sourced Merino next to skin.

Smartwool's Raglan sleeves eliminate shoulder seams for perfect comfort under a pack, and smooth merrow stitching wraps from side to front to keep you looking as good as you feel.

Signalling the next step in sustainable sportswear, ODLO’s Men’s ACTIVE WARM ECO Half-Zip Turtleneck base layer top is an essential part of your winter arsenal.

Crafted from 100 percent recycled fibres, this versatile men’s base layer has been crafted to keep you warm, dry and comfortable whilst enjoying winter pursuits. 

The Men's Zone Base Layer Set. Dare 2b's best-selling base layers made with thermo-regulating BODY knit-fabric.

Sweat-wicking and seamless - so comfy you will want to wear them every day. These layers regulate your core temperature by keeping you cool when you're sweating and warm when your cold.

The soft-touch, stretch fabric offers full range of motion and features in-built odour control to keep you feeling fresher for longer. Quick-drying and form-fitting.

Our versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Long Sleeve Crewe is our best-selling base layer top.

Meet the better-than-ever Men's Classic Thermal Merino Base Layer Crew.

Smartwool have updated this 100% Merino wool fan-favorite with a new fit to improve functionality while enhancing aesthetics. Shoulder panels eliminate top shoulder seams and a flatlock seam construction helps prevent chafing.

Add one of Smartwool's best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or biking.

Lifa® Max is dual layer 100% Lifa® that ensures sweat is transported away from your skin while the dual layer gives you the warmth. This is our warmest base layer and is built for low to medium activity.

Warm, dry and sustainable – welcome to the future of sportswear with ODLO’s Women’s ACTIVE WARM ECO Half-Zip Turtleneck base layer top.

Crafted from 100 percent recycled materials, this versatile base layer brings an environmental ethos to the core of your sportswear.

ODLO's ACTIVE WARM ECO KIDS base layer Bottoms are a versatile base layer that gives premium warmth and long-wear comfort when the weather gets colder but you don’t want the fun to end.

A customer favourite for decades, the ACTIVE WARM range offers fantastic insulation against the cold and optimum moisture management to keep your kids warmer and drier for longer. 

Smartwool's Women's Classic All-Season Merino Base Layer Bottoms are the perfect layer to put on for your warm-weather adventures.

Made of lightweight, breathable Merino, these base layer pants have an updated fit that improves functionality while enhancing aesthetics for a wide range of body shapes. We wrapped our super-soft, responsibly sourced Merino around a nylon core to give it added durability, so it can keep up with you.

Wherever you're going and whatever you're doing, our lightest weight base layer bottoms are perfect for adventures during all seasons.

The enhanced thermoregulation and exceptional comfort delivered by the ACTIVE X-WARM ECO Long-Sleeve base layer top make this versatile garment a winter-weather essential for active women.

Using soft insulation pads to protect particularly sensitive areas of the body from the cold, the ACTIVE X-WARM range provides excellent insulation as the cold sets in, while excellent moisture management properties guarantee you stay warm and dry at all times.