It doesn't look like a foot protector, at least none I've seen. This is the ordinary base card for Springer. I didn't catch in the flagship set. This bothers me that I have no idea what that thing is.
On a side note. Mark you should be getting your Sanchez today, and I now have the Hicks you needed. Greg you should be getting the Buehler today, and I have the Yelich base you need now.