Take this 40 oz. tumbler to the pool, yoga studio, office or on the go for maximum refreshment. This tumbler is made of stainless steel with double walled vacuum insulation and features an ergonomic handle plus a splash-proof straw opening. The 3" diameter base fits in any standard cup holder. Keeps drinks hot for up to 12 hours and cold for up to 30 hours. Must be sold in lots of 20. Material: Stainless Steel, Polypropylene, Silicone; Copper Lined.