National Geographic Snorkeler & Swim Tuna 2 S Jr Combo Blue 2161 The National Geographic Experience Snorkeler Tuna 2S JR Combo (Yellow) has a CE tempered lens mask for safe distortion free clarity Frame : lightweight Delrin and plastic - Mouthpiece : orthodontic design and optimal fit - Snorkel tab : easy to mount and secure Lightweight Delrin and advanced lightweight plastics frames