The Insulated Classic 20 oz water bottle by Klean Kanteen is based on their classic stainless steel 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. One of Klean Kanteen's top-selling insulated water bottles, great for on-the-go hydration.