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 cans. This makes the perfect gift for those who want to enjoy a cold drink while out on a day-trip or camping outdoors.