Hollis M4 Dive Mask

When choosing a mask, fit and field of vision come first. The M4 gives you the best of both worlds, fitting a wide variety of faces and offering superior peripheral and vertical vision. It is low profile, stows easy and carries an excellent value. When choosing a mask, fit and field of vision come first. The M-4 gives you the best of both worlds, fitting a wide variety of faces and offering superior peripheral and vertical vision. It is low profile, stows easy and carries an excellent value.