The Atomic Aquatics Frameless mask is about fit, comfort, and vision. The large lens and close fitting skirt work in harmony to create perhaps the widest viewing angle of any frameless mask design. The lens shape was computer designed to maximize upward, downward, and side to side vision. Squeeze to adjust buckles are tucked behind the lens for a sleek hydrodynamic design.Features:Optical quality, distortion-free UltraClear lenses Frameless construction is simple, hydrodynamic, and leak free Extremely large viewing area with low volume Great fit Squeeze to adjust buckles Clear or black silicone rubber with co-molded color accents Standard fit is designed for most adults with average to wider faces - see the Medium Fit version for a narrower version for women and teens Designed to fold flat to fit in a pocket or included compact travel case