This mask has a single tempered glass lens, and is designed for snorkeling, swimming and scuba diving.

Tempered glass.

The skirt is made from soft hypoallergenic transparent silicone. 

The visibility provided by the single lens and the unusual shape of the frame extends in all directions. Excellent seal on many face types, average internal volume.

Quick-release strap buckles.

ScubaSnorkMask 100HighQualitySilicone ScubaSnorkMask EasyAdjustableBuckle ScubaSnorkMask Mask1Window ScubaSnorkMask MaskAdultSize1W ScubaSnorkMask MaskTemperedGlass