Smartwool Women's Classic Thermal Merino Base Layer 1/4 Zip is even better this time around with an updated fit for better movement and cuter aesthetics. Boasting 188g weight, this base layer top is one of Smartwool's heaviest-weight tops, letting you enjoy temps below 25°. Made from 100% responsibly sourced Merino Wool that keeps your temperature regulated as you enjoy the rigors of winter sports, whether it's running or taking some runs on skis.
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