Speedo Junior Hyperdeep Mask and Snorkel Set G.O. FIT System: Get full coverage and comfort with the mask fit Wide angle lenses maximize peripheral vision Silicone skirt for water-tight seal and comfort Speed fit clips for quick, easy adjustments Rigid, interlocking frame crates added support Designed for smaller, narrower faces Purge valve removes water quickly Dry-top snorkel prevents water front entering top while surface swimming Snorkel safety alert whistle allows you to safely notify other from a distance Silicone mouthpiece