Iron Flask is Here to Insure You Have the Hydration Needed to Get You Through the Day and Crush it! #yougotthis. Features 18/8 Stainless Steel and is vacuum insulated to keep your tumbler condensation free. The powder coated exterior finish offers durability and an easy grip. Each tumbler is packaged in a color matching gift box. Icy beverages stay cold up to 16 hours and hot beverages preserve their temperature for up to 4 hours. This tumbler is cup holder friendly so you can take it anywhere and is 100% BPA Free and non-toxic. It will never leave a metal taste or rust. 2 insulated lids are included with every tumbler, Splash proof lid with straw, extra straw and a flip lid. The flip lid provides a tight-fitting, 100% leak proof seal. You can carry your tumbler with you without any worry.