Keeps drinks cold for 15 hours. Drinks stay iced for 3 days. Created with recycled 18/8 stainless-steel. Double-wall vacuum insulation. AeroLight featherweight technology uses spun steel that is 33% lighter than standard stainless-steel drinkware. Leakproof Fast Flow Lid is designed for easy pouring, drinking, and cleaning. Easy-carry handle with cap holder. BPA-free. Dishwasher safe. 36 oz.