The Perka Roak Stainless Steel Bottle with Copper Lining has a double wall construction with vacuum seal and copper lining for added insulation. This bottle features a ridged grip for easy handling and a stainless-steel twist off cap with silicone ring. The exterior is powder coated to reduce sweating and the cap has a hinged steel carry handle for easy pick up. Liquids stay hot for 12 hours and cold for 24. FDA compliant and BPA free. A portion of all proceeds is donated to Shelter to Soldier, a non-profit organization that rescues dogs to train as service animals for veterans in need.