3/8" thick foam for superior insulation and that old school style Full bottom with vent hole for easier entry/removal of cans Fits most standard (traditional) cans of 12 oz size. Keeps drinks colder longer and hands dry Helps prevent surface damage by limiting condensation 3/8" thick foam for superior insulation and that "old school" style. Full bottom with vent hole for easier can entry and removal. Fits regular diameter 12 oz cans. Keeps drinks colder longer and hands dry. Helps prevent surface damage by limiting condensation.