150 Zone Merino Base Layer – Women's

Built for high-output days in the heat, the 150 Zone is our pick for women who want a merino baselayer that actually breathes. Corespun fibers — nylon wrapped in merino and blended with Lycra — give you durability and stretch without losing that next-to-skin softness. Mesh ventilation panels at the upper back and sides pull heat out fast when the trail heats up.

• Merino mesh panels at upper back and sides dump heat during high-output efforts
• Corespun construction wraps nylon in merino wool, then blends in Lycra — more durable than standard merino with the same soft feel
• Raglan sleeves and underarm gussets let you move freely without the shirt pulling
• Flatlock stitching sits flat against skin so there's no chafing under a pack or on long runs
• Light enough to wear solo on a warm trail run, structured enough to layer under a shell in cooler weather