I’ve ran a transitional lens for over a decade. It just isn’t ‘instant’ but the trade off is I don’t have a solar panel sticking out from the front of my visor.

And while other chemical-based photochromic visors that engage when hit with UV rays exist, they can take close to a minute to transition, or become activated even in cloudy conditions when they don't need to. When light hits a solar panel mounted at the top of the visor, it immediately powers the visor's liquid crystal film for an instant transition.

My understanding is transitional lens aren’t legal for road use in the EU/UK either. So thought it was odd that an Italian company was making these…then

The co-branded visors can be fitted to Race-R Pro, Aeron GP and Aeron lids, generally suited for track use.