The Klean Kanteen Classic 20 oz. Insulated Bottle with Loop Cap is based on a classic stainless steel water bottle combined with Climate Lock double-wall vacuum insulation, keeping drinks hot for 20 hours and iced for 50 hours! Klean Coat powder coat finish is 4X more durable, chip-resistant, and safe for people and the planet. 18/8 Stainless Steel construction Climate Lock double-wall vacuum insulation will keep drinks hot for up to 20 hours Klean Coat powder coat finish is 4x more durable t