Snorkelling set use the most stable dry floating valve design,and the flexible breath tube is easy to breath and drain. The diving mask is made of tempered galss lenses which can prevent strong ultraviolet rays,and the lens surface has been specially anti-fog treatmentThis mask features a single layer of tempered glass lens designed for snorkeling,swimming and scuba diving. The skirt is made of soft hypoallergenic transparent silicone,the ultra visibility provided by the single lens and the unusual shape of the frame extend in all directionsDiving Mask is made from soft transparent or food-grade silicone,and comes with great comfort,The skirt of eco-friendly materials won't make your face allergic,and it's easy to clean after use,especially suitable for long-term use in free diving,without feeling uncomfortableThe mask has an adjustable strap that is easy to operate, adapts to a large number of facial types