Features PC Lens: The Lens Is Made Of Polycarbonate And Imported High-grade Silica Gel, With Long-lasting Anti Fog, Anti UV, Anti Impact Effect. Spectacles Frame: The Frame According To The Design Principle Of The Streamlined And Ergonomic Design. The Strap: Adjustable Silicone Head Strap, With Strong Elasticity Can Be Suitable For People Of Different Sizes And Comfortable Wear. Sealed Type Silicone Gasket: It Can Prevent Leakages, Heightening And Thickening Design Can Reduce Eye Pressure.