Hello – I used to be diagnosed yrs ago with MCS in addition to a nickel allergy. I a short while ago have come to Assume I'm allergic to polyester. It is actually a little bit of a nightmare hunting down all of the various names you'll find for polyester! https://rubbersandals83826.theisblog.com/34558500/new-step-by-step-map-for-rubber-slippers