Made for the outdoors. Hydro Flask's TempShield insulation has redefined what the classic outdoor water bottle can be. It keeps your beverage icy cold or piping hot from trailhead to summit and every step in-between. Your perfect "all day and into the next" refreshment solution. It is the ideal hydration companion for those long days in the office or a full day on the beach or trail. Now with the new Flex Cap for ultimate portablity. Whether you're in the Arizona summer or the Alaskan winter, Hydro Flask's 18/8 stainless steel double wall vacuum insulation will keep drinks icy cold for up to 24 hours and hot liquids hot for up to 6 hours. The wide mouth opening is makes pouring easy, and the new BPA-free Flex Cap is insulated to further protect your beverage from outside temperatures. Hydro Flask's 18/8 food-grade stainless steel interior is non-porous, with rounded corners to help eliminate bacteria buildup, unwanted odors and lingering flavors. Along with high performing and high.