"Colder Beer is Better. It's Science." The genuine, real deal, BottleKeeper Standard 2.0 12 ounce bottle holder. Built for those who hate warm beer but love warm hands. Bottle opener built into cap with tether. Attached cap seals inner bottle for extended freshness, Padded for impact resistance, Powdered coated exterior for superb feel and durability. To use, simply unscrew bottom portion, insert bottle into body, replace bottom portion and screw on cap for colder, longer lasting beer.