. This two-window mask uses LiquidSkin technology offering very light weight, exceptional comfort and unbeatable durability. The Bi-Silicone design lends two different types of silicone: a firmer portion for support structure around the nose acting like a cushiony bumper and a softer portion for contact with your face. Tri-comfort crafting with small horizontal ribs on the skirt redistribute the pressure exerted by the frame onto the skirt ensuring maximum comfort. It is 45% softer for unparalleled comfort and 270% more elastic for a perfect fit.Features:Weight: 173g.LiquidSkin Bi-Silicone for maximum comfortBi-Silicone strapTri-comfort crafting helps redistribute pressure for a great fitTwo year limited warranty