Whale MK-501 Black Swimming Goggels Diving Mask Food grade Liquid Silicone skirt and strap, very durable, health and comfortable. Reliable soft silicone second seal(inner seal) ensure Leak-Proof and fit virtually any face shape. Simple style strap won't pulling hair and High volume masks offer a feeling of openness and extend peripheral vision. Very tough and ultra clear tempered glass lens, Four-window Wide Field of Vision. Hassle-free Guarantee: Whale Diving Mask offer worry-free 1 year warranty and lifetime friendly customer service.If you have any issues, you are welcome to contact us for quick and easy support. We will happily replace any defected products.