I've been wearing them at work for a week straight in the cold 20-30's with just a Patagonia cap 1 thin lightweight baselayer and been plenty warm walking in camp and hiking. It's nice to be able to vent the pants and dump the heat on the way up. Nice softshell material on outside and nice very thin fleece grid lining on inside. The legs do run a tad bit longer than expected, but nothing terrible. I feel I run pretty normal leg inseam at 30/32 and these feel a tad bit longer, maybe a 34?