They keep your toesies warm and cool, self regulating and dryer, natural, less smelly than cotton and synthetic blends. Don't burn off if you stick then too close to the hearth. Dry quite quickly and when they get a hole in them you can use them as mittens.
@David7307 I'd look them up online so you can see some users reviews. As durability is sometimes a hit & miss between brands. My last two pairs of Aldi wool socks shrunk even with wool wash (never again).