The Hydro Cell water bottle is designed to keep up with your outdoor adventures and be the perfect companion for the city. Made from the highest quality 18/8 stainless steel on the market, the Hydro Cell double-walled water bottle can keep liquids cold for up to 24 hours or hot for up to 8 hours. It has been subjected to numerous tests in terms of stated protection times and has performed successfully in all tests. The Hydro Cell is available in a variety of sizes and colors and comes with a stainless steel screw cap that creates an airtight vacuum, as well as a straw cap that is perfect for your sporting or urban activities. Click here if you want more information.