The Insulated Classic 20 oz bottle is based on Klean Kanteen's classic stainless steel water bottle, combined with Climate Lock double-wall vacuum insulation, keeping drinks hot for 24 hours and iced for 63 hours! Chip-resistant Klean Coat powder coat finish is durable and safe for people and planet. This bottle is one of Klean Kanteen's top-selling insulated water bottles, great for on-the-go hydration.