Smartwool Intraknit Base Layer Crew

GearJunkie most breathable women's base layer pick, using Smartwool's Intraknit construction to precisely map insulation and mesh ventilation zones to the body. Merino-poly blend delivers warmth, odor resistance, and exceptional airflow during high-output cold-weather runs. Praised by GearJunkie testers across seven straight ski and running days.