Tendol&trade; Scuba Diving Mask/Diving Mask Purge Valve/Silicone Skirt/Metal Frame Tendol&trade; There are many scuba-diving gear but the one you choose should be the one that will greatly enhance your experience. You will want the following features: High Quality Silicon Skirt - The Diving Mask Is Manufactured Using 100% Highest Quality. Its Extremely Soft Silicon For The Skirt Region Offers Maximum Comfort And Increases The Life Span Of The Diving Mask Stiff Metal Frame With Wide Vision Range - The Wide Diving Mask Enables The User To View An Extremely Wide Range Of Vision With Its Wide Single Tempered Glass Lens And Has A Hard Frame To Support The Lenses And The Skirt Includes Nose Purge Valve And Replaceable Strap Offers Super Comfort Even For Those Wearing Glasses