Sport Prescription Glasses and Goggles – Photochromic Polarized Lenses - Removable Clip for Pescription Lenses - Interchangeable Arms and Strap – P399FT by Bertoni Italy: Frame: matt black (AF399A) or shiny black / red (AF399D) anticrash polycarbonate - thanks to their excellent grip at arms, at the adjustable nose pads and moreover with the elastic strap,  this sunglasses will stay in place. Included a Removable Optical Insert for Prescription lenses - any strength friendly – Your optician can easily assemble your prescription lenses to the clip – Prescription sportsunglasses for Cycling MTB Tennis Football Motorbike Etc. Lens: photochromic polarized from light smoke filter 2 to grey filter 3 - it adjusts to the brightness. Polarized lenses: reduce reflections of horizontal surfaces. This lens combines both polarizing and photochromatic features. Interchangeables arms with elastic adjustable strap to have a very skin tight fitting making sports - black hot printing logo. The inside of the front frame is covered with a removable windproof soft foam for a comfortable fitting, specially when used with the strap. Wraparound design: protects the eyes from wind and bad weather, provide enhanced peripheral vision - Size: suitable for all types of faces (narrow to large).