U.S. Divers Captain 4 LX Pro Tech Series Mask with Neoprene Strap Cover and Case One-size-fits-all dive mask with 4-window design for wide viewing Hypoallergenic silicone face skirt and strap combine comfort and durability Windows built into the sides help increase your peripheral vision Expanded top-to-bottom viewing windows; translucent blue color Easy-to-adjust Pro Glide buckle system; 2-year limited warranty