Merino wool underwear for everyday comfort and active days. The slim-fit Anatomica Briefs feature a classic underwear design and contoured pouch for added support. Made with icebreaker's corespun fabric, these briefs offer the support and comfort you need in a classic design. The ultralight 150gm fabric is made with merino fibers wrapped around a nylon core, for underwear that is durable yet soft next to your skin. Merino blend regulates body temperature in all weather conditions, the contoured pouch provides comfort, and flatlock seams help reduce friction. Material Composition: 83% Merino Wool, 12% Nylon, 5% LYCRA. Icebreaker harnesses the performance qualities of natural fibers to offer an alternative to clothing based on petrochemical synthetics. Merino is an annually renewable fiber that naturally resists odors, keeps you cool when it's hot and warm when it's not, and lets your skin breathe for comfort all day, every day.