WrightsockCoolMesh II Quarter Running Socks for Men and Women – Cushioned, Eco-Friendly Anti Blister Socks - American Made

usually i wear size 11.5 wide shoes should i get the large or x-large sock?

Do these socks (Wrightsock Men's Coolmesh II Quarter Single Pack Socks) have any "antimicrobial" agent in them? I hope not; I am allergic to same.

I constantly end up with wear on the heel of my shoes, leading to them being unwearable way too fast. Will these socks help minimize that?

A woman with shoe size of 9-9.5 (American) needs sock size L? Thank you!