Flip and sip.Hydration on the go just got easier with the leakproof insulated Flex Straw Cap. Add it to your favorite Standard Mouth Hydro Flask bottle to easily enjoy cold hydration anywhere.Leakproof when closedStraw is easy to trim to fit your favorite Hydro FlaskFlex Strap is easy to transport and comfortable to carryInsulated for maximum temperature retentionRemovable components for easy cleaningDishwasher safeNot intended for use with hot liquids