I have been wearing this brand of wool sock for work going on six years. I purchased a two pack, tried them out for a couple of months, and then went back and bought a dozen pairs. This dozen pairs lasted me almost six years, wearing them five days a week sometime six and for up to 14 hrs per day. The come up about mid-calf on me and i do not find them too hot for the summer. They are 48% acrylic, 40% wool, and 11% nylon. I purchase them at sportmans warehouse and they typically run about 15.00 dollars for two pairs.