The Cressi F1 Frameless Mask features a silicone skirt assembled directly over the glass, eliminating the need for additional assembly. This unique system, found in the Cressi F1 model, ensures excellent visibility in all directions, particularly to the sides. With the silicone skirt allowing for maximum proximity of the eye to the glass, the mask offers exceptional peripheral vision without causing discomfort or pressure on the front or high part of the nose.