Intraknit Thermal Merino Base Layer Crew – Women's

When cold temps meet high output on the trail or mountain, this is the base layer we reach for first. Smartwool's Intraknit construction places merino insulation and ventilation zones exactly where your body needs them — so you stay warm without overheating. It works equally well under a shell or as a standalone piece on milder days.

• Intraknit body-mapped zones deliver targeted warmth in core areas and active ventilation where you run hot — no guesswork, no dead zones
• Merino wool blend regulates temperature naturally, wicks moisture, and resists odor across long days in the field or on the trail
• Ergonomic fit moves with you during high-output activity and layers cleanly under a mid or shell without bunching
• Seamless construction eliminates the friction points that cause hot spots and chafing during all-day wear
• Available in Black-White, Cherry Lacquer-Black, Pacific Blue-Nightfall Blue, Dusty Teal-Charcoal, and Serene Blue-White — sizes XS through XL