This is a Quality Tilos 4 Lens Scuba Dive Mask with Nose Purge It features: Quality Construction Nose purge Fits Medium to X-Large Faces Four windows for maximum vision Soft pliable yet durable silicon skirt for comfort Soft nose for easy equalizing Tempered glass Stylish Look Adjustable mask strap Purge is easy to use and efficient Wide mask strap for secure comfortable fit M410 This Tilos four Window with Purge Scuba Mask is a GREAT durable mask ideal for easy clearing of trapped water, maximum vision, and stylish look! Great for scuba diving and snorkeling.