Tusa's Freedom Pro One Mask is a Low-Profile Low Volume Two Window Mask that features the newly developed and revolutionary Freedom Technology delivering Superior Fit, Comfort and Performance. The Freedom One Pro is one of the first next generation Tusa Masks offering this innovative new technology combined with Superior Design, Build Quality, Materials and Frame Construction. Freedom Model Masks feature a Dimpled Skirt Surface with Varied Silicone Thicknesses and Stability Ridges in addition to a Proprietary Low-Friction Double Feathered Edge Skirt Surface on the Fitting Line. The Quick-Adjust Buckle System incorporates a newly-designed Low-Profile Buckle into the Black Silicone Rubber Skirt of the Mask. The result is a Compact, Lightweight, and Technologically Advanced Mask Design that can be Easily-and-Quickly adjusted for a Perfect Fit. Tusa's Round Edge Skirt features a proprietary round edge cross-sectionally shaped skirt. This rounded edge results in a Soft Fit that Suppresses Pressure and Reduces Creasing left on the face. The "Planar Fit, instead of Linear Fit" silicone skirt maintains great fit and unprecedented comfort, you won't have Ring-Around-the-Eyeballs" like with other masks. Tusa's Patented 3-D Wide Split Strap is a true Three-Dimensional Design that Snugly Fits against the Head's Natural Curvature. The 3-D Strap offers Unprecedented Comfort and Fit unlike standard flat mask straps. The Freedom One Pro Mask Lenses are Tempered CrystalView.