40 OZ WATER BOTTLE: The stainless steel insulated reusable water bottle keeps drinks cold for 24 hours, and hot up to 12. This Hydro Flask bottle is dishwasher safe and easy to clean. 24 HOURS COLD. 12 HOURS HOT: Double-wall vacuum insulation keeps drinks hot or cold for hours. The insulated bottle keeps beverages cold for 24 hours and hot up to 12. The TempShield insulation keeps the water bottle cool to the touch. LEAKPROOF: Say goodbye to leaky water bottles. The Hydro Flask Flex Cap is leakproof when closed. Toss it into your bag without worry. PURE TASTE: Durable pro-grade stainless steel ensures pure taste and no leftover flavor transfer. So, today's water won't have any taste of yesterday's iced tea. DISHWASHER SAFE: Easy to use and easy to clean, just toss the lid and bottles into the dishwasher. Designed to keep bright color, being dishwasher safe means your favorite Hydro Flask is always at-the-ready.