The Insulated Classic 12oz (355ml) bottle is based on our classic stainless steel water bottle, combined with Climate Lock double-wall vacuum insulation, keeping drinks hot for 16 hours and iced for 41 hours! Chip-resistant Klean Coat powder coat finish is durable and safe for people and planet. Great bottles come in small packages, now with a narrow profile. Perfect for on-the-go hydration in your backpack, purse or cup holder.