Providing warmth, natural odor resistance and breathability for cold-weather activities, the Kari Traa Floke base layer top blends fine merino wool with tech fibers for a soft, medium-weight fabric.

Underwear TopsBase Layer Tops

Inspired by trail runners who complain of regular sports-bra straps digging into shoulders underneath hydration pack straps, the Oiselle Flyout bra solves for that while providing support and storage.

UnderwearSports Bras

Apparel should never be an obstacle. The Oiselle Flyout Zip bra has the same fit, coverage and rear pocket of the Flyout bra, but with a convenient and comfortable zip-front closure for easy on/off.

UnderwearSports Bras

A racerback compression sports bra for light-impact activities, the Kari Traa Froya's stretch fabric offers next-to-skin comfort and freedom of movement. Wool lining at front turns up the snug factor.

UnderwearSports Bras

Great for wearing under other layers, the women's Kari Traa Fryd base layer pants feature a supersoft, quick-drying material that moves with you and cuts out chafing so you can get out exploring.

Underwear BottomsBase Layer Bottoms

When you're giving it all you've got, you need layers that work with you. The women's Kari Traa Fryd base layer pants dry fast, stretch with your body and reduce chafing.

Underwear BottomsBase Layer Bottoms

Great for wearing under other layers, the women's Kari Traa Fryd base layer top features a supersoft, quick-drying material that moves with you and cuts out chafing so you can get out exploring.

Underwear TopsBase Layer Tops

From trekking in Thailand to traversing tough terrain in Baja, ExOfficio has spent decades perfecting the art of adventure—and underwear. Here are their Give-N-Go 2.0 Full-Cut briefs for women.

UnderwearUnderwear Bottoms

From trekking across Thailand to traversing the toughest stretches of Baja, the ExOfficio Give-N-Go 2.0 Sport Mesh bralette provides comfortable, low-impact support for wearers with A–C cups.

UnderwearSports Bras

Set the groundwork for greatness with the Janji Groundwork Long bra. It provides essential coverage for high-output movement and even doubles as a sleek stand-alone crop top.

UnderwearSports Bras

Laser-cut for a clean finish and barely-there feel, the sleek Kari Traa Idunn Hipster underwear fit well under your workout tights. They also give 4-way stretch and dry quickly for functional comfort.

UnderwearUnderwear Bottoms

Designed to help you go the distance, the New Balance Impact Run AT Bra features a spacious back pocket and bungee system to keep your essential gear easily accessible while you're out on the trails.

UnderwearSports Bras

Offering medium support for your runs, the Nike Indy V-neck sports bra reimagines everyday comfort by moving the adjustability up front so it's easier to get the perfect fit.

UnderwearSports Bras

Offering low-impact support while you're working up a sweat, the Nike Indy V-neck sports bra reimagines everyday comfort by moving the adjustability up front so it's easier to get the perfect fit.

UnderwearSports Bras