HIGH-DEFINITION TRAINING -- Anti-UV, radiation reflective lens, to protect your eyes well even when swimming in the outdoor pool or sea. Anti-fog coating interior, these swimming goggles give you a clearer, better underwater swimexperience. LEAK PROOF - Double Lens Liner is very soft and high density creating a locking ring around your eyes - stays perfectly fastened to your face - no water leaks and you will feel more comfortable. BUILT DESIGN - The earplug is attached to the swimming goggles - Soft, comfortable, and waterproof - no more worry about earplug falling. DURABLE - Lenses are made of high quality shock resistant and anti-scratch polycarbonate material, The nose bridge is made of high hardness material to prevent bending with repeated use which makes the swimming goggles unbreakable. Easy to Adjust -- Adjustable Silicone Strap Length, Detachable Buckle, More Easy to Wear and Remove Glasses. Adjustable Size Swim Mask Goggles - Fits Adult, Men, Women, Teens, Youth, Girls, Boys, Kids Ages 8+ Usage: 1. Place lenses on your eyes, check if lenses are well fixed around your eyes. 2. Adjust the strap to fit your head size. 3. Press the lens slightly to get the air out of it, then start to swimming. 4 Slip the thumb into the headband and move it forward to remove the swimming goggles. Maintenance: 1. Clean the glasses in the water and air dry, do not wipe the lenses with your finger or a towel. 2. Put the swimming goggles in the protective box and in a cool dry environment - avoid putting them under the sun or in high temperatures. 3. Keep your swimming goggles from dirt, oil, scratches and hard objects to avoid injury of lens coating.