Fitted and stretchy, and made from a blend of merino and icebreaker's Corespun fabric, the Merino 150 Anatomica - Ski Day boxer briefs give you the support and comfort you need every day and during your weekend activities. This icebreaker-exclusive model is made from Corespun merino wool fibers wrapped around a nylon core, for a fabric that's soft against the skin. Inspired by nature, icebreaker harnesses the performance qualities of natural fibers and offers an alternative to garments made from petrochemical synthetic fabrics. Merino wool is an annually renewable fiber that naturally resists odors, keeping you cool when it's hot and warm when it's cool. Plus, it lets your skin breathe comfortably all day, every day.