HEAD SWIMMING Marlin Mask, Snorkel, & Fin Set The latest HEAD Marlin set combined with the new Volo One open-heel fin with patented OPB technology for easy kick. Includes mesh bag. Mask Snorkeling-specific version of MARES X-VU mask. 4 lens mask design. Beveled corner side windows provide excellent peripheral vision. Silicone. Environmentally friendly hybrid packaging includes a reusable mask box. Snorkel Flexible mouthpiece. Wide barrel for easy breathing and clearing. Side clip allows easy attachment to mask strap. Dry design prevents excess water from entering snorkel. Fins Uses patented OPB technology for comfortable, easy kicking. Channel-Thrust design features give users the maximum thrust for minimal effort. Quick-release buckle system allows easy removal. Open heel. Flexible and ergonomic rubber foot pocket. Stiff plastic blade.