U.S. Divers Avalon DX Mask and Island Dry Snorkel One-size-fits-most; 3-window mask offers panoramic visibility; Comfortable Siltech face skirt; 3-way adjust Pro-Glide buckles for easy adjustments Snorkel Features Submersible, dry top snorkel; Designed to keep water out of the breathing tube above and below the surface of the water Snorkel placement - Place snorkel on left side of face attaching snorkel keeper clip to mask strap