Promate Scuba Dive Mask with Panoramic View Windows & Snorkel Set -Clear for Snorkeling Scuba Diving Three-window style mask with edgeless technology on sides for a panoramic view of vision Double edge and channeled skirt for comfortable fit The easy-adjusting swivel buckle and hypoallergenic silicone face skirt mask The fully submersible Dry top snorkel with housing whistle and quick disconnect retaining clip One way purge valve on the bottom of snorkel easily clear water out and replaceable