Water Bottle, 17oz Stainless Steel Water Bottles, Vacuum Reusable Leak Proof About this item 24 Hours Cold 12 Hours Hot: Sfee insulated water bottle design of double-wall vacuum insulation technology can keep heat for up to 12 hours and keep cold for up to 24 hours. The steel water bottle can keep warm for up to 12 hours. You can bring hot water, ice water, drinks or freshly brewed coffee with you. A large enough mouth (1.3 inches) can fit ice cubes, which is a big advantage. The humanized design allows you to enjoy coolness in the hot summer and warmth in the cold winter.