The Hydro Flask 21 oz. Standard Mouth With Sport Cap Water Bottle is designed using the TempShield™: Hydro Flask unique double wall vacuum insulation protects temperature for hours. Cold drinks stay icy cold and hot drinks stay piping hot so you can stay refreshed for any adventure.
- Versatile, middle-of-the-road size, equipped with our insulated Sport Cap
- TempShield™ insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours
- Durable 18/8 Pro-Grade Stainless Steel construction
- BPA-Free and Phthalate-Free
- Compatible with our Standard Mouth Flex Cap
- Lifetime Warranty
- Sport Cap is not intended for use with hot liquids and is not leakproof