The 20 oz. GWGHunt Stainless Insulated Tumbler is made out of 18/8 grade stainless steel and will not sweat out the greatness it carries. This Tumbler is every hunters dream! It will keep your cold drinks ice cold through the long days of hunting and your hot drinks steaming through the brisk late nights. The GWG Tumbler is BPA free, handwasher safe, and ready for your next outdoor adventure!