Just to update. They do OK, better than any others I have had so far. My feet get cold easily. I have found the best thing is a light pair of Darn Tough wool socks with a pair of Wiggy's Lamolite socks over that. I bought a size 12 and wear an 11 for shoes and boots I would wear when cold is not a concern.
I've had a pair of Crispi Nevada GTX now for four seasons and they have been put to the test. Mine are non-insulated but they make them with insulation as well. They are 8" and have not leaked. If I ever wear these out I'll get another pair. Buy with confidence.