The snorkeling mask is the window to the underwater world. Those listed are all tempered glass lenses and have hypoallergenic silicone skirts. You will see single, double, triple and even four lens available in a range of colors. While you would assume that all styles come with a silicone strap, we do offer some with a neoprene strap and some with a purge valve. Are you confused, read our articles, watch our videos or visit Expert Advice.