WranglerMen's Western Boot Socks (Three Pairs)

Are these "true" boot socks? meaning ... "thick material" socks like my cowboy boot retailer said i should wear with my Laredo's. most don't state.

Do these socks keep your legs warm in the winter?

What shoe size do these socks fit? I wear an 11.5 4E wide shoe.

Do they stay up? when i walk my socks slid down in to my boots. and what size would i need for a size 14