Hydro Flasks TempShield insulation has redefined what the classic outdoor water bottle can be. The 32 oz 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. The 40 oz is one of the largest bottles offered by Hydro Flask, making it the ideal hydration companion for those long days in the office or a full day on the beach or trail. Stay cool and hydrated all day long, no matter where your adventures take you.