or https://www.sportsbikeshop.co.uk/motorcycle_parts/content_rev/29696 I got mine free with a lid purchase.
Giving his age away I have a Laser helmet with a reactive visor which is normally good except for suddenly entering shaded roads below trees. Sometimes I think an internal dark visor would be better but at least I won't get nicked for it.
I wouldn't be riding about with a visor under my leathers , bit like a bacon slicer in an accident situation, lots of lovely internal organs there. Yum yum.