Classic Thermal Merino Base Layer 1/4 Zip – Women's

For cold-weather trail runs, winter hikes, and frigid camp mornings, this is our go-to heavyweight merino base layer for women who don't slow down when temps drop. The 100% merino wool interlock knit regulates body heat and kills odor naturally, no matter the output level. The quarter-zip and raglan sleeves give you on-the-fly ventilation and unrestricted movement without fighting your layers.

• 100% merino wool interlock knit delivers genuine warmth, moisture management, and natural odor resistance through long, hard days
• Quarter-zip collar lets you vent heat fast on climbs without stopping to strip layers — pull it open, keep moving
• Raglan sleeve construction and flatlock seams eliminate bunching and chafe during high-output movement
• Slim, body-contoured fit with back-seam-to-front wrap sits cleanly under a shell or pack harness without bulk
• Available in standard sizes XS–XL and plus sizes 1X–4X across solids, heathers, and prints including Fair Isle and Digi patterns