The Oceanways UV Glare Blocker Mask has an exclusive ARC coating that's specifically designed for snorkeling and diving to let in more light than standard lenses. The innovative high-definition tempered glass lenses with anti-UV and anti-glare protection provide exceptional clarity. These lenses reduce lightwave length to make your underwater viewing easier on the eyes with more definition of viewed objects. The Oceanways Mask also features a nose purge. Fits most faces. The snorkel has a silicone mouthpiece with a large drain valve below it and a wave-guard tube top.