Whether it's filled with steaming hot tea or ice-cold H20, the Hydro Flask 40oz Wide Mouth Water Bottle with Straw Lid is built to keep your coffee, water, or soup close at hand, with just the right temp of course. Its stainless steel, 18/8 TempShield insulation keeps water ice-cold for up to 24 hours, and it also ensures hot drinks stay toasty for up to six hours. Hydro Flask also equipped this model with a straw lid for for a quick sip when you're on the move.