Used Fourth Element Tech Scuba Diving Fins Black X Large Underwater Lenses Ports and Lens Gear s lenses from damage when large knife with a s lenses from damage when traveling or when stowed in a dive bag between dive trips All 3 Lenses are made from Tempered Glass incased in a Tough and Durable Polycarbonate Frame with a Soft 100% High Quality Silicone Rubber Skirt The wider blade gives manoeuvrability without compromising the power which is there when needed Spring straps with comfortable heel pads keep the feet securely held in place and these spring straps can be removed and changed easily with everyday tools if required