The National Geographic Snorkeler 2 Piece VAYA Set Mask and Fins (Yellow/Black) has a CE tempered lens mask 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. Snorkel has an 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. 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!