National Geographic Snorkeler Explorer Two Piece Combo: Marlin 2 Mask and Marlin Semi National Geographic Snorkeler "Explorer" Masks & Snorkel Set. 100% Silicone , Hypoallergenic mask - Toucan Yellow Low Profile Double pane, Tri-View CE Tempered lenses. Frame-Lightweight Delrin and plastic. Clear wide field and increase periphial vison. Mask Strap-flexible and replaceable with - 3 point hold. Ratchet Quick lock (RQL)- mask strap adjustment Mask Skirt-feathered edge seal. Semi Dry Marlin Snorkel with Splash Guard. Wide Breath tube for comfort and ease of breathing and air displacement. Silicone Mouthpiece (orthodontic design for maximum comfort) Patented "Pinch & Lock" Snorkel Tab; East to attach and secure to your mask