Double insulation wall to maintain the temperature for twice as long. Revolutionary, self-locking Jet Valve valve that allows large flow without unwanted leaks. Lightweight and easy to press. The composition 100% BPA-Free TruTaste with HydroGuard επιτρέπει allows you to taste your water, not the hermit crab! Large opening, allows you to quickly refill or add ice. It can also be used in winter to keep your drink warm!