Without the need for assembly, the silicone skirt of this scuba diving mask is simply placed over the glass. This technique ensures good visibility in all directions, particularly to the sides, by allowing a maximum approach eye/glass without giving irritating pressures on the front or the high area of the nose. The skirt of this scuba diving product is particularly adaptable to a variety of faces and provides excellent comfort even when worn for long periods of time. For this very reason, many snorkelers, swimmers & divers choose this watersports equipment for underwater adventures like scuba diving, swimming and snorkeling.