Not sure about the shoes portion, but perhaps that is in reference to the foot pedal option for the Mustang 1 V2?

I also have this wonderful amp. It also appears to be the only model still "sold" as current Mustang V2 series from the Fender website and retailers. There has been a newer Mustang GT series released but without an equivalent 20W practice amp level or PC software.

Fortunately I've found that the Fender Fuse software still works well with my Windows 10 PC. I hope that the software continues to be supported.