S'ip thermos bottles keep your drinks cold for up to 24 hours and hot for up to 10 hours. Put your bottle in your bag without worrying about spills or leaks. The bottles feature a leak-proof cap for added protection against spills. They are made of double-wall insulated 18/8 stainless steel. Don't forget your S'ip by S'well is not dishwasher safe, hand wash only!