The Smartwool Classic Thermal Merino Base Layer 1/4 Zip provides amazing warmth with even more comfort. An updated fit keeps you toasty without losing focus on functionality and fashion. Crafted from Merino Wool wraps your body with minimal seams to reduce chaffing' keeps you completely dry, and regulates temperature. This baselayer is slightly heavy and is a perfect option for those who want to maximize their warmth. No matter what the activity the Smartwool Classic Thermal Merino has you covered.