i wear one pair of really good socks, so i don't need 2 pairs
however, I used to buy Nike socks and I beleive they are the worse. Blisters, poor quality, 1/2 the seam is stuck in the corner of my shoe... They are 100% cotton and are hard to get on and off the feet with almost no stretch. I suffered for a year until I switched to Thor-lo polys, and now I can run 10 miles without a blister!