Tilos Excel, Scuba Diving Snorkeling Free Diving Frameless Mask Ultra low volume made with high quality Tempered Glass, anti-fog. The Excel mask is made with 100% silicone, a better and longer lasting material than plastic PVC. The best for a Perfect and Comfortable Seal. Quick Release Adjustable Buckles for better comfort. Designed and created using Innovative and Patented Manufacturing Technology. Tilos has over 25 years experience in the dive/snorkel/swim industry. Top quality gear you can trust.