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

Built for high-output cold-weather days on the mountain, the Intraknit Thermal Merino 1/4 Zip is our top base layer pick for women who run hot and cold on the same climb. Smartwool's 3D Intraknit technology places merino insulation and mesh ventilation exactly where your body needs them, so you're not fighting your base layer to stay comfortable. The quarter-zip gives you instant airflow control when the pitch kicks up.

• 3D Intraknit technology zones merino insulation and mesh ventilation based on where your body actually generates and loses heat
• 100% merino wool construction wicks moisture fast, resists odor through multi-day use, and stays soft against skin under a shell or pack
• Seamless construction eliminates friction points that cause chafing during long efforts with a heavy pack or tight-fitting outer layers
• Quarter-zip front closure lets you dump heat quickly on steep ascents without stopping to remove a layer
• Articulated rib-knit elbows add durability and unrestricted arm movement where base layers typically wear out first — available in Black/Charcoal