What Our Gearhead(R) Experts Are Saying:"This bottle is a lifesaver on long hikes. The Flex Straw Cap makes it super convenient to sip while on the move, and the insulation keeps my water ice-cold all day."We trust the HydroFlask 40oz Wide Flex Straw Bottle to keep us refreshed and hydrated during our most demanding adventures. Thanks to TempShield(R) insulation, our drinks stay cold for up to 24 hours, ensuring icy refreshment whether we're summiting peaks or logging hours on the trail. The Wide Mouth design accommodates ice cubes with ease, while the durable straw cap provides effortless, one-handed hydration on the go. Designed for convenience, this bottle is dishwasher safe for easy cleaning and compatible with all HydroFlask Wide Mouth caps and lids. Its pure-taste design ensures no flavor transfer between beverages, and the rugged construction is built to last. Whether we're tackling an intense hike or enjoying a relaxing day outside, this bottle is always up to the task.