DESIGN & TECHNOLOGY: Over-the-glasses goggles for kids Youth fit OTG technology Cylindrical carbon X-lens Fog-X technology eliminates fog and moisture with an anti-fog protection Floating foam membrane eliminates temple pressure from eyeglasses Designed with ample interior space for a comfortable fit DriWix dual layer face foam for cushioned comfort Dual-slide adjustable strap for a secure fit Silicone strap across the back for a fit that stays in place Semi-rimless Helmet compatible Prescription glasses compatible Manufacturer's lifetime warranty Use spec chart to determine VLT (Visible Light Transmission) Range and Recommended Conditions for lens color