Our double-walled vacuum insulated water bottle is made of 304 stainless steel, which is known for its excellent insulation properties. This means that it will keep your beverage cold for 24 hours and hot for 12 hours, making it perfect for all-day hydration. Screw cap designed with a tight seal to prevent leaks and spills, so you can have peace of mind while you're on the go! The compact size makes it easy to put in your backpack or car cupholder, and the carrying strap ensures that you can take it with you wherever you go.