Features of the Hydro Flask 32 oz Lightweight Wide Mouth 25% lighter than Hydro Flask's other 32 oz bottles thanks to a premium titanium design TempShieldA(R) Double Wall Vacuum Insulation eliminates condensation and keeps beverages cold or hot for hours Honeycomb insulated wide mouth cap withflexible perforated strap and aluminumpivots all cut weight Tapered walls Are thinner up top to saveweight but thicker on the bottom to boostdurability Cold liquids stay cold for 24 hours and hot stay hot for 12 hours