The Rocky Mountain Tumbler is an innovative way of keeping your cold drinks cold and your hot drinks hot. The secret is the double-wall vacuum insulation that keeps cold drinks cold up to 24 hours and hot drinks hot up to 12 hours. This innovative technology provides a sweat-free design. It’s made of kitchen grade stainless steel so there’s no metallic taste. It features a clear lid so you can view the level of your beverage. The lid features a watertight seal so no more spilled drinks. The Rocky Mountain Tumbler holds approximately 880 mls. of liquid. It features a non slip grip. The Rocky Mountain Tumbler is bpa free.