JORMATTMens Truly No Show Cotton Low Cut Socks With Non Slip Grips

How thin is the material these are made of? I have a problem with tighter fitting shoes and other not shows bunching up when i try and use them.

My fiancé is a size 10 in shoes. Should I get the 6-10? Or 10-14?

Is it possible to buy a pack of only grey or only beige socks? Thanks!

What size for men's 11 1/2 shoe?