Speedo Glide Mask/Snorkel (Blue) Polycarbonate lens provides the ultimate in safety without sacrificing clarity. Soft and comfortable hypoallergenic seal Speed Fit headstrap makes adjusments quick and easy Snorkel features a pre-bent tube for ultimate performance and fit while the purge valve makes for easy clearing if water enters Hypoallergenic silicone mouthpiece for maximum comfort with a splash guard to prevent water from entering