Shoe inserts on Shabbos

Hi,

One may put a shoe insert into a shoe on Shabbos, to make the shoe wearable; it is considered part of the shoe, and not a separate entity that is "fixing" the shoe. One may also wear the shoe outside of the eruv, with the insert in it.

[Note: Some prohibit putting an insert in a shoe for the first time; this view is referenced in the Rivivot Ephraim here, but he does not state his own view.]

(Rivivot Ephraim 1:225)

Have a great day,
Mordechai