Premium quality neoprene. Perfect for keeping your seltzer, beer, energy drink, or any tall 12oz can cold. These coolies are made of 3mm neoprene. 12oz Slim Can Coolies are intended for 12oz Slim cans. Single Ink Coolies can be screen printed on single side, double side, or triple side. Noeprene Coolies have an exposed seam on each side and are printed with screen printed on one or both sides.