Been wearing the 875 almost every day for the past month, except 1 or 2 occasion I wore the 9013. The 875 is starting to mould to my feet and the initial aching and soreness is gone! Now my feet just slips in and sits comfortably. Absolute pleasure!
This is what I like to do whenever its a sunny day; Sun the interior to get rid of the god-knows-what inside there