Tusa M-31 Visio Tri-Ex Mask. The M-31 Visio Tri-Ex mask is a revolutionary new 3-window design offering an ultra-wide 168° panoramic view. This amazingly wide viewing angle is achieved by the incorporation of domed side windows and the significant reduction of frame structure around the lenses, increasing the field of vision by dramatically over traditional masks.

The TUSA VISIO TRI-EX M-31 mask gently conforms to the contours of your face. Constructed with silicone, this mask has been crafted for divers who want a wide front lens combined with a low volume design. Like all TUSA masks, it incorporates a wide range of features to enhance comfort and provide clarity of vision.

Additionally, the Visio Tri-Ex is equipped with TUSA’s patented Five Position Strap Adjuster, Round-Edge Skirt and 3-D strap for superior fit and comfort.