In our Men's Intraknit™ Merino 200 Pattern 1/4 Zip, Merino Sport yarn combines the power of Merino with the durability and fast dry times of polyester - equipping you to stay out and adventure farther. This Smartwool® base layer is 3D-mapped for a near-custom fit and freedom of movement, while ribbed elbows provide extra flex room. New technology allows us to seamlessly knit mesh ventilation in gender-specific zones designed to help keep your body dry and warm as you zip up and venture out in comfort.