No More Side Sunny Days for Prius Drivers
They say necessity is the mother of invention ...
I didn't like the sun coming in through my side window(s) due to the sun visor not being long enough (horizontally-speaking) to keep the sun's annoying rays from coming in.
So I invented one that's adjustable, fitting most passenger vehicles' sun visors, including Prius. It's called Sun Visor Extender.
Once installed it stays put.