The Vortex 4-in-1 Stainless Steel Can Cooler features double-wall vacuum insulation with its stainless steel construction and serves 4 functions including insulated tumbler, 12 ounce can cooler, slim can cooler, and bottle cooler. Use the insulator ring for cans and bottles to keep them cold for up to 4 hours. When used as a tumbler it keeps drinks hot for 3 hours or cold for up to 9 hours. Hand wash only. BPA-free and FDA-certified.