WORRY-FREE SALES SERVICE: As long as you are our customers.If unsatisfied,please contact us freely and we would offer you a futher better solution within 24 hours,you can buy our products with confidence. EASY TO USE AND FITS FOR MOST: The mask has an adjustable strap that is easy to operate, adapts to a large number of facial types, and is lightweight and ideal for free diving. FOOD-GRADE SILICON MATERIAL: Scuba Diving 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 uncomfortable. CLEAR LENSES AND PANORAMIC VIEW: This 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 directions. ANT FOGGING AND NO LEAKING: 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 treatment.