The Insulated Classic 20oz bottle is based onKlean Kanteen'sclassic stainless steel water bottle, combined with Climate Lock double-wall vacuum insulation, keeping drinks hot for 20 hours and iced for 50 hours! Chip-resistant Klean Coat powder coat finish is durable and safe for people and planet.One of our top-selling insulated water bottles. Climate Lock double-wall vacuum insulation will keep drinks hot for 20 hours and iced for 50 hours. Klean Coat powder coat finish is 4X more durable than our previous finish and formulated for human and environmental health (Brushed Stainless has no coating). Electropolished interior, a safe & non-toxic process, and rounded corners make it easy to clean. Hand washing is recommended for all Insulated products. Backed by the lifetime Strong as Steel guarantee.