Stretchy and slim-fit merino wool boxers made with icebreaker's corespun fabric, the Anatomica Boxers with Fly are supportive and comfortable for daily life and weekend adventures. The exclusive icebreaker fit features merino wool fibers corespun around nylon, for a durable fabric that feels soft next to your skin. Inspired by nature, 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.