The Tusa Visulator M-14 Dive Mask is clearly different. It is designed with changes that radically enhance your visibility underwater. The first important difference is the larger lens providing a wider field of view. The second important different is the decreased distance from the lens to the eyes. This is accomplished by making the frame as thin as possible and moving the fitting line slightly to the outside. These changes result in more improvement in your field of vision. The Tusa Visulator M-14 is extremely comfortable and features a 5 position strap angle adjuster for a perfect custom fit on every face and head.