With the Hollis M4 dive mask you get it all: superior peripheral and vertical vision, a soft frameless silicon skirt, all in a low profile mask. The frameless design and soft silicone make the M4 suitable for a range of different forms of faces. It creates a great seal, which is crucial if you don’t like water in your mask. The low volume frame is easy to clear, should you ever get water in your mask or if you have to take it off entirely. In addition, the fit of the mask is easy to fine-tune with the adjustable mask strap.