DEO-FRESH - BLACK: Keeps your feet and shoes fresh. Go sockless! if you want to because Deo-Fresh-Black is hand washable. Deo-Fresh-Black is made of pure, soft, cotton terry and durable, natural sisal fibers that are safe for prolonged contact with bare skin. Sisal has been used for centuries to make rope on ships. This makes Deo-Fresh-Black ideal for boating, cruising, warm weather travel, tennis, walking-you name it. With Deo-Fresh-Black your feet and shoes stay cool and comfortable.