Underwear

Icebreaker's 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. With the soft merino fibers, they will help regulate the body's temperature, no matter weather conditions while also resisting odors.

A versatile women’s merino wool go-anywhere base layer shirt made from breathable 100% merino wool jersey, the 200 Oasis Long Sleeve Crewe is Icebreaker's best-selling base layer top. The merino fibers help regulate your body temperature in all weather conditions and resists odors.

A versatile women’s merino wool base layer shirt with a zip-neck design for added ventilation and breathability, the 200 Oasis Long Sleeve Half Zip combines casual comfort with technical performance. Icebreaker Oasis base layers are what the company is famous for. These best-sellers are designed to contour the body and will easily flex with you, allowing maximum movement, whatever the activity. Not too heavy, not too light, the Oasis is made from 100% merino midweight jersey, making them your go to base layers for year-round layering and everyday comfort.

Change can be a good thing! Smartwool has improved the fit on their 100% Merino bottom with new side seams and a curved seam in the back that provides a slimming effect, while reducing sag and excess fabric. Their Women's 250 Baselayer Bottoms are designed to keep you doing what you love while staying comfortable, helping with temperature regulation and wrapping you in unbelievable softness.

Meet the new and improved Women's Merino 250 Base Layer Crew. Smartwool updated this 100% Merino wool fan favorite with new color options and an enhanced fit to improve functionality while elevating aesthetics. The addition of shoulder panels and its flatlock seam construction help prevent chafing and increase your comfort level. Add one of their best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or biking.

Meet the new and improved Women's Merino 250 Base Layer Crew. Smartwool updated this 100% Merino wool fan favorite with new color options and an enhanced fit to improve functionality while elevating aesthetics. The addition of shoulder panels and its flatlock seam construction help prevent chafing and increase your comfort level. Add one of their best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or biking.

Meet the new and improved Women's Merino 250 Base Layer Crew. Smartwool updated this 100% Merino wool fan favorite with new color options and an enhanced fit to improve functionality while elevating aesthetics. The addition of shoulder panels and its flatlock seam construction help prevent chafing and increase your comfort level. Add one of their best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or biking.

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

Smartwool has updated the fit of their Women's 250 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 keep you comfortable and temperature-regulated as you enjoy high-intensity skiing, hiking, running, and more.

Built to fit, flex, and follow you like a shadow, our Women's Intraknit™ Thermal Merino Base Layer Bottom uses our innovative 3D knitting technology to create our most insulated, ventilated, and flexible base layer bottoms ever. These women's wool pants feature Merino Sport yarn to offer the power of Merino paired with the durability and fast dry times of polyester — perfect for skiing, running, and all your high-intensity training.

An incredibly warm merino base layer for the coldest months of the year, the 260 Tech High Rise Leggings are go-to piece for winter layering—ideal for skiing, snowshoeing and other cold-weather pursuits.

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

This minimalist-style crew is anything but insignificant. The Women's Intraknit™ Thermal Merino Base Layer Crew is a lightweight, super-moveable top, made for all of your most extreme cold-weather activities. With Merino Sport yarns and gender-specific ventilation perfectly placed to maximize thermoregulation and breathability in high-intensity activities, it helps amplify moisture management, movement, and comfort. When you're in our best base layers, you're ready for anything.

A midweight merino base layer top designed to help regulate temperature during high-intensity activity, the 200 ZoneKnit™ Long Sleeve Crewe features 100% pure and natural merino wool.

Smartwool's Intraknit™ fabric is 3D-knit with Merino Sport yarns to be lighter weight with a cleaner finish. This women’s wool baselayer is perfect for a day of outdoor activity in cool to warm weather, because it will help keep your body dry and comfortable, and its fit won’t slow you down. For all your hiking, jogging, or other athletic adventures, this top will be there for you.