Merino wool is known around the world for its incredibly fine fibers that are used to create super-soft, itch-free products that keep you warm in the winter and cool in the summer. Each fiber contains thousands of tiny little pockets that trap air to insulate you against the elements. The Hincapie Merino Base Layer features comfortable flat-lock, cover-stitching in an itch-free design that helps regulate the body's temperature for maximum comfort, regardless of the conditions.