TUSA Two Window Low Profile Platina Mask The M-20 Platina mask eliminates the inner frame that blocks the field of vision and attaches the lens directly to the frame to realize a super-slim frame. The Direct Sashing System (D.S.S.) results in a major increase in the upper/lower-left/right visibility range. It also achieves a major narrowing of the center joints connecting the left and right lenses to eliminate the vision field split. Like all TUSA masks, it incorporates a wide range of features to enhance comfort and provide clarity of vision. FEATURES Direct Sashing System (D.S.S.) Narrow center joint eliminates vision split Corrective lenses available (MC-20)