There's just enough sock there for the heel pad to be in the right place on my foot (9 1/2 Men's). So there's no way these will fit on someone with larger than a 10. They do stretch however, after some wear; but actually getting them on can be difficult. Just spend the extra money and buy the other ankle socks from Hanes. I thought these were the ones, but the more expensive ones are the socks that are comfortable.