Don't know of them, but they have an impressive
web site.
I walk with two pairs of explorer socks. A knee high pair against the skin, then a normal length pair over that.
Something I have just realized - it's the same long pair I've had for more than 15 years - and they are still fine.
My feet are fairly stuffed anyway, so I doubt some expensive socks would help me in any way. What are they worth anyway?
On the subject of expensive socks, some people have been talking fairly highly of the socks that have the copper in them to stop the stink, but that's one problem I have never had so I don't need them either... So I also don't know what they're like for comfort.