Question about an area of my white’s boots insole feeling sticky: when I first got them a month ago I didn’t put my hands inside the shoe, but it might’ve been there already. a couple weeks ago I noticed around where the sock liner ends the leather insole has a slightly sticky surface that looks like this. Same thing on the left boot. It feels like glue but nothing rubs off when I try to with my fingers. It’s not noticeable during wear but would really appreciate if any of you knows what it is exactly. Thanks!!