The Reflect 20oz water bottle is made of three materials: sustainably harvested bamboo, stainless steel and food-grade silicone. No paint. No plastic. Just a deliberate design that embodies our mission to change the way that people think and drink. Climate Lock™ double-wall vacuum insulation keeps things cold for 24 hours and iced for 40 hours! NOTE: Not recommended for very hot liquids due to steel bamboo cap.