The Smartwool Men's Intraknit™ Thermal Merino Base Layer Pattern Half Zip Hoodie is a warm and stylish way to kick off your winter wardrobe. It uses Merino Sport yarn, which combines the natural power of Merino wool with the durability of polyester for more confident pursuits. Revolutionary Intraknit™ technology and body-mapping techniques allow warmth, ventilation, and mobility everywhere you need it. The Smartwool Men's Intraknit™ Thermal Merino Base Layer Pattern Half Zip Hoodie will have you feeling and looking your best every time you get out there this winter season!