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The Smartwool Classic Thermal Merino Base Layer 1/4 Zip is a thermal-weight top made from 100% merino wool, built as a first layer for cold days on the mountain. The quarter zip vents heat fast when you climb or hike, and flatlock seams and shoulder panels cut chafing under a pack or shell. The slim fit slides under ski and snowboard layers without bunching. Against synthetic base layers it trades quick-drying speed for better odor control and a softer feel against skin; against lighter merino weights it is warmer but bulkier under a tight shell.
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Owners of Smartwool's merino base layers consistently praise warmth without clamminess and odor control over multi-day use. Complaints center on durability at wear points and the trim cut.
This quarter-zip base layer is made from 100% merino wool. The thermal-weight fabric helps manage temperature, moisture and odor as your activity changes.
It has a slim fit that layers smoothly under ski or snowboard gear. Flatlock seams reduce chafing, and the quarter-zip neck allows ventilation. Shoulder panels are included.
For fit, choose a close fit that lets you move freely. For extra warmth, add a midlayer rather than sizing up the base layer.
