Specifications: The parts of this 3 in 1 snorkel mask that touches the face is made of soft silicone, well fit the face, special designed mask can be used as snorkel mask, swimming goggles and diving mask. Gravity ball in the breathing tube automatically opens/ closes the air inlet, under the action of water pressure and gravity, to ensure air circulation and water will not enter the breathing tube. Important Notice: This snorkel mask is suitable for adults and youth whose outer concerns of eyes 4.7 inch, we don't recommend people whose face width is less than this distance to purchase this product . Please ensure the sealing of the silicone ring, don't get your hair, swimming cap and other things stuck in the silicone ring when wearing, or it may leaks. You can rub toothpaste on the inside of both lens with your finger for around 5 minutes when first use, then wash with water, this will be helpful for preventing lenses fogging. Please clean your diving mask after diving because high salinity seawater may be corroding your diving equipment. Package Contents: 1 * Snorkel Mask Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.