The Men's Stay Warm Coffee Charcoal Compression Tech Pant SIO16 was engineered to provide warmth, comfort, and durability for the performance athlete while performing in cool, cold, and wet weather conditions. The SIO16 fabric has been enhanced with Coffee Charcoal™ fabric which has been tested to provide natural heating elements and to wick away unwanted moisture. The Coffee Charcoal™ infused fabric can regulate the body's temperature (raising the temperature in cold, harsh conditions) up to 10˚ F. The SIO16 can be worn alone or as a layer of outerwear.