Double-wall vacuum insulated. This is not your regular cup holder. Our premium, durable insulated can cooler is designed to withstand all of your adventures. The Load-and-Lock Gasket secures your drink in place, and No Sweat Design keeps your hands dry while your drink stays cold. The Colster Stubby Holder is designed to fit 375ml drink bottles and cans. This makes the perfect gift for those who want to enjoy a cold drink while out on a day-trip or camping outdoors.