Change the way you hydrate with a bottle constructed from sustainable bamboo. natural cork. and high-quality 18/8 food-grade stainless steel. Double-walled vacuum insulation technology keeps drinks cold for up to 24 hours and hot for up to 6 hours. Each bottle is wrapped in a layer of non-slip. condensation-free cork to prevent drops. No paint. no plastic. and built to last a lifetime. This may be the only bottle you'll ever need.