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

For cold-weather runs, ski days, and winter hiking, the Intraknit Thermal Merino 1/4 Zip is our top pick for women who need a base layer that works as hard as they do. Smartwool's Intraknit construction places insulation and ventilation exactly where your body needs them, so you stay warm without overheating. The 1/4 zip lets you dump heat fast when the trail heats up.

• Intraknit™ technology creates distinct insulation and ventilation zones across the body — more warmth where you need it, more airflow where you don't
• Merino wool blend naturally regulates temperature, wicks moisture, and resists odor even across multi-day efforts
• Seamless knit construction eliminates the seams that cause chafing under a pack or tight outer layer
• 1/4 zip collar gives you quick ventilation control on the climb without stripping off layers
• Body-mapped fit is cut close enough to layer cleanly under a shell or mid-layer without bunching