3mm thick Neoprene - great protection and shock absorption for your lenses. * Belt Loop - allows to attaching the pouch to your belt, for convenient carrying. * Hook - allows you attach the pouch to anywhere with a ring (such as camera bags and backpacks). * Approx Interior Dimension: can put LENS not over 4.1" (L),3.7"" (diameter) * REMARK : Please note that the usable height of the pouch is 1-2cm lower than the overall height because of the drawstring closure.