Body Glove Oasis Mask and Snorkel Fins Set, Blue, Small/Medium Mask 2 Widow Design Low Volume Mask Pivot Buckle for Custom Fit Easy Adjust Strap Clip For Easy to Adjust and Lock the Strap Tempered Glass Lenses Meets All ANSI Standards Snorkel: Purge Valve for Easy Clearing of Water from the Snorkel Submersible Dry to Prevent Water Entering Into the Tube Pre Bent Flex Section Reduces Jaw Fatigue Great for Snorkeling or Scuba Replaceable Mouthpiece Fins: Drain Holes Preventing Water Being Retained Inside Foot Pocket Soft Rubber Foot Pocket Adjustable Straps for Custom Fit High Efficiency Channel System Designed to Maximize Thrust & Minimize Fatigue 2 Sizes: Small/Medium and Large/X-Large Anatomically fit Body Glove brand tried and true