The DicaPac WP510 Waterproof case for digital cameras are made of non-toxic materials (RoHS) and are tested and are of waterproof grade JIS IPX8 (Japaness Industrial Standard"s highest waterproof grade). Underwater lab tested to 16ft . Patented roll and velcro zipper system which allows full funtionality of camera controls. It also has a removable optical lens with diffused reflection prevention. The big addition is a polycarbonate quality lens (clear and hard to break) opening that lets you take pictures with zoom control even when the camera is in the pouch. The lens has a 3-layer coating both inside and outside. (UV coating, Water repellent coating, Scratch resistance coating for quality pictures.) It also floats when you drop it into water.