It's amazing! It keeps your hot drinks hot, your cold drinks cold, and you perfectly happy. The Arctic Zone Titan BPA free 20 oz. Stainless Steel Tumbler is a rugged companion for an extended wander with your Golden Retriever any time of year. The tumbler’s triple layer interior construction consists of a copper plated interior layer, 18/8 stainless steel and high pressure, vacuum sealed insulation that provide up to 24 hours of cold and up to 8 hours of heat. Fits in most car cup holders. Good to go wherever your Golden takes you!