Shifter cover?

[kmac]

I am curious if anyone uses one of these?

http://www.ebay.com/itm/Red-Rubber-Shift-Sock-Boot-Shoe-Protector-Shifter-For-Yamaha-R6-R1-FZ-6-1-8-/380805609282?pt=Motorcycles_Parts_Accessories&fits=Make%3AYamaha%7CSubmodel%3AXTZ1200&hash=item58a9c87742&vxp=mtr

I do not always ride in riding boots, sometimes I ride to church or somewhere I do not want to ride in boots or just run errands in shoes and the shifter leaves black marks on them.
Do these covers slip off easy, fall off, or create a weird shifting issue at all?

 

[greg the pole]

easy fix.

spare pair of shoes in one of the bags.

Never used them before. Riding in anything less than work boots gives me the creeps.