The National Geographic Snorkeler Tunny2 Set (Yellow/Black S/M 5-8) has CE tempered lenses for safe distortion free clarity. Lightweight Delrin and advanced lightweight plastics frames. Feathered edge mask skirt seals comfortably and distributes sealing pressure. Pliable non feathered nose piece for ease of equalization and mask clearing. Ratchet quick lock masks strap adjustment. Flexible replaceable mask strap with 3 point hold design. Snorkels – Orthodontic designed mouth pieces to avoid jaw fatigue. Easy mount snorkel tab to secure snorkel to mask. Wide bore tube for proper air displacement and exchange. Properly sized components to accommodate widest range of snorkelers. Variety of splash guards to keep the snorkel dry under most conditions. Fins – Soft comfortable foot pockets available in a full foot or adjustable open heel. Ratchet Quick Lock system is utilized on the open heel design with the option of replaceable fin straps. Both designs can be worn with or without additional foot protection such as Bootie or Neoprene socks. Blades made from carefully selected composites to maximize the snap & flex for the desired task, combining as many as three different materials to achieve the appropriate desired thrust to energy exertion ratio. Variety of blade styles allow for a proper selection whether going for a gentle leisurely swim over a reef or burning calories in the lanes of a local pool. The National Geographic Snorkeler Carry Bag can be comfortably used to carry your Snorkeler equipment to and from your water based activities time and time again!