The Guardian Sea Ray Snorkel Mask has a dual window design with tempered glass lens for maximum clarity and scratch resistance. The easy-adjusting strap and buckle provide a great fit.• Great fit for kids age 4 and up• Dual lens with tempered glass for ultimate strength and clarity• Easy-adjusting strap and buckle• Soft PVC facial skirt for comfort Easy-adjusting strap & buckle for a great fit Soft PVC facial skirt for comfort Great for kids age 4 & up | Guardian Scuba Guardian Kids' Sea Ray Mask