Intraknit Thermal Merino Base Layer Bottom – Women's

Built for active cold-weather pursuits where warmth and breathability have to coexist, the Intraknit Thermal Merino Bottom is our pick for skiers, winter hikers, and mountaineers who run hot on the climb. Smartwool's 3D Intraknit construction maps ventilation zones and insulation exactly where you need them, so you're not cooking on the ascent or freezing at the top. The slim, close-to-body fit layers cleanly under anything without bunching.

• 3D-knit construction integrates insulation and mesh ventilation zones in a single seamless piece — no seams to chafe, no bulk to fight under a shell
• 52% Merino wool blend regulates temperature naturally, wicks moisture, and resists odor across multi-day trips without needing a wash
• Body-mapped articulation built into the knit structure allows unrestricted movement whether you're skinning uphill or dropping into a steep trail descent
• Slim performance fit sits close without compressing — layers cleanly under ski pants, softshells, or hiking pants with zero bunching
• Available in Black-White, Emerald-White, and Nightfall Blue-Deep Navy across sizes XS–XL, so you can match your layering system or just pick your color