Kolder NFL San Francisco 49ers Kaddy Kolder NFL Can Holders These foldable can holders are constructed from 3mm Neoprene "Wetsuit" rubber. They are designed to keep your favorite beverage COLD... and your hands WARM! The holder is collapsible & has sewn seams on two sides. The neoprene construction means it is easy to remove the bottle from the holder no pliers needed.