Paladineer 21-ounce Vacuum-Insulated Stainless Steel Water Cup Bottle Thickening of 304 stainless steel material Crafted with an durable stainless-steel interior and exterior. Food-grade silicone seal Food grade PP,environmental health and safety without peculiar smell. Thermos patented vacuum insulation is designed for maximum temperature retention. Environmental health and safety without peculiar smell.High-end technology to ensure heat/cold vacuum layer. Double-wall vacuum-insulated stainless steel keeps beverages hot for 6- 12hours or cold for 5 hours.