These socks are great. Warm and cushioned underfoot, without being bulky. I have not worn them trekking yet, though I intend to; I just bought them to keep my feet warm in the depths of winter. They do this. I am seriously impressed.
My feet have not got sweaty either, the wicking system really works for me. I was sceptical about it because I've bought other woollen socks with the "Coolmax" system" of wicking before, and found my feet always clammy.
I now understand why Bridgedale have such a good rep, and would not hesitate to recommend them to others. The blue ones look good, too, without taking up tons of room when packing.