The Kifaru Koozie will Keep your cans cold. Slim fits skinnier 12oz cans such as hard seltzers and energy drinks. Standard size will fit all normal diameter cans. Standard – (2.75” diameter x 4” tall internal dims) - Will fit most standard 12oz cans (12oz Coors cans are a little smaller but will fit), and Stubby glass bottles. Will fit 16oz cans but will be a little short. Slim – (2.5” diameter x 5.5” tall internal dims) - Will fit Redbulls, Seltzers and long neck glass bottles.