Features: 1.The inner surfaces of the lenses are coated with the latest Anti Fog Environmental Treatment Technology, that provides maximum Anti Fog protection for your goggles, and is safe for your eyes and skin also offer a clear and long distant view to focus on swimming under water with 180-degree peripheral vision. 2.Premium silicone material and Ergonomic design used on the goggles ensure a snug fit on different facial forms and never allows water leak in. 3.The silicone gaskets are super-soft and comfortable. They create a perfect seal every time due to their double-seal design, they are around the eyes, which can distribute the pressure evenly and provide a maximum comfort, never leave red marks around eyes and nose for hours after swimming. 4.Easy adjustment of the elastic strap and soft silicone seal ensures a comfortable and snug fit for most face types. the strap is easy to adjust between sizes and the quick release clasp on the side means you can fit them in seconds without getting them tangled in your hair. 5.Customer service: With customer satisfaction as our first priority, we offer a satisfaction service for all of our merchandise. If you have any problems, please contact us in time. We will give you replies as soon as possible. Specifications: Material:Silicone Product Size:Frame:140mm in width Weight:Single Swim Goggles:37g Swim Goggles+Box:110g Notes: 1.Due to the effects of light and shooting angle, the actual color of the item may differ slightly from the color shown on the picture. 2.Due to manual measurement,please allow 1-3cm measuring deviation.Thank you for understanding