Multisport Hiker Plus
Sam's Club special. Inexpensive, durable, comfortable. These are solid socks. They have gone through the wash a lot and they seem to be sturdier than my REI socks and maybe my Smartwools. I think there is a slight sacrifice in softness, but I don't really notice. I have not tested these on any trips though, just wearing them around town. Full review
Awesome base-layer. Just spent a week in Minnesota ice-fishing in temps ranging from -15°F to +25°F, and this did not let me down. My core never did get cold. Also wore them on a hiking trip with temps from +30°F to +55°F with awesome results. Wicked the moisture away from my skin when I was bush-whacking and warm when I needed them to be. Highly recommend! Full review
Omni-Wool makes Merino wool socks and base layers.