Fantastic socks.  Cool in summer (really), warm in winter.  Enough airflow to keep feet dry and comfortable.  They are quite thick, so if you have tight shoes/boots it can be a bit tough to squeeze them in..

My favorite use for them - motorcycle rides.  I have pretty heavy, tall leather boots and the first time I tried the socks in the boots I thought these would be waaaay too tight and hot.  Wrong on both counts.  The socks are cushy enough to conform, and on hot , long rides (90f+, 300+miles)  I pull the boots off and no stink, no sweat, no worries.  They're almost.. magic.  They have just enough nylon to keep most of their shape, but not enough to cause sweaty feet.  I have no idea how/why anyone wears socks with more than 30% nylon.

Awesome stuff.