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).
The clip can be used both with and without the sweat sponge. The optical clip of this model can also be used with the Bertoni F366A and AF366A models.