Since I am one of those people who constantly have cold feet, I need, especially in winter, really good socks. In the summer I try when it comes to make do without socks, the rest of the year I'm wearing Woolpower! The socks are just super comfortable, keep your feet warm, not sweaty and do not smell so quickly (I change already no longer a day, is with these socks simply no longer necessary). The only drawback, and hence the downgrade After washing they look really not that great, they form nodules. In my Icebreaker Socks that is not so, but even if I am fully convinced otherwise by Icebreaker: The Woolpower socks are warmer! When it gets really cold, I take the 400, more was not necessary. I own four pairs of 200 and two pairs of 400, so I've been coming 2-3 years of great, my other socks I wear hardly. Only now are partly due to the thinner heels sites visible. Anyone with nodules has no problem can be accessed safely.