Beautiful in its simplicity and deliberate in its design, the Insulated Reflect 20 oz water bottle is crafted using sustainably harvested bamboo, food-grade silicone, and stainless steel. Just three materials united into the ultimate expression of Klean. No paint, No plastic. Crafted of high quality 18/8 stainless steel inside and out with double-wall vacuum-insulated which will keep drinks cold 20 hours or iced 40 hours. The Bamboo Cap is crafted from a single piece of stainless steel, finished with a beautiful piece of bamboo and easy to carry with the stainless steel loop. Not recommended for very hot liquids due to steel bamboo cap.