This is the Tilos Panoramic 3 Lens Mask with Nose Purge for Scuba and Snorkeling Features: Patented channeled skirt design directs purged bubbles away from view Tempered glass lenses Crystal silicone skirt and strap Packaged in heavy duty plastic box Patented innovative Panoramic technology allows the glass joint to appear invisible when worn by the user, creating a truly uninterrupted panoramic view.