The M-31 Mask is an Ultra-Wide Panoramic View Three-Windowed Mask Designed to Increase the Field of View and Improve Safety. Conventional Three-Lens Masks have Blind Spots, but Tusa has reduced the Size of these Blind Spots through the use of Domed Side Windows, creating a Wide-Angle Panoramic View. The Front and Side Windows provide an Ultra Wide Viewing of 168°. 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 5 Angle Strap Adjustor allows for a 5-Position Micro-Adjustment on both the left and right sides of the mask. This enables Vertical (up/down) and Horizontal (left/right) Pressure on the Face to be Delicately Adjusted for the Optimum Fit. This Low Volume Mask has a Double Feathered Edge Silicone Rubber Skirt and an Easy-to-Reach One-Hand Nose Pocket for Ear Equalization which can be utilized even when wearing thick gloves. A Wide Split Mask Strap Design provides even pressure on the Face Seal for a perfect Fit. Mask is available