The Boroux Jacket is perfect for keeping your 12 oz aluminum cans and glass bottles at the ideal temperature for hours. Fits most car cup holders, and perfect for travel and outdoor events. The double wall insulated stainless steel wall is powder coated giving your JACKET a unique look. The Jacket has a silicon ring base that eliminates the need for coasters. The BPA-FREE screw on Thermocuff ring secures in the temperature.