Winterize your running wardrobe and look stylish with the Smartwool Intraknit Thermal Merino Base Layer 200 Half Zip. This minimalist-style crew is lightweight, super-moveable and made for high-intensity activities. Wear it by itself or as a baselayer. Smartwool designed the top to give you comfort and performance. It is durable, wicks away moisture, regulates temperature and resists odor. Smartwool thought of everything an athlete needs when they knit mesh ventilation zones in gender-specific zones to keep you dry and comfortable. The half-zip style allows you to adjust ventilation. The 3D mapping gives you the perfect fit and freedom of movement, while ribbed elbows provide added durability. Plus, there is a hood to keep your noggin warm. The Smartwool Intraknit Thermal Merino Base Layer 200 Half Zip will have you ready for the outdoors, whether you are running, skiing, sledding or hanging out by the fire.