These are the gentlemen's slippers made with a patented fabric that regulates the internal temperature to ensure the wearer's feet are always comfortable. Developed for NASA to help astronauts adapt to extreme temperature fluctuations, the fabric absorbs and stores excess body heat to prevent overheating, releasing it back to the skin as the temperature drops to keep feet warm. The uppers are made from supple deerskin suede from the Adirondack mountains with a 100% polyester lining and collar that wicks moisture away, keeping feet dry. The footbeds provide four zones of softness to support different areas of the feet while the skid-resistant, thermoplastic rubber outsoles stretch to help the foot absorb shock. Brown or Black. SIZE SMALL. (1 1/2 lbs.)