The Smartwool Hike Classic Edition Light Cushion Second Sock is spun from 2nd Cut(TM) yarn, a blend of recycled fibers pulled from Smartwool's own sock take-back program and manufacturing waste, combined with virgin Merino wool. Light Cushion runs the full length of the foot, giving the trail underfoot comfort without extra bulk. A Virtually Seamless(TM) toe keeps the fit smooth, so nothing about wearing a recycled sock feels any different from a standard one. What Our Gearhead(R) Experts Are Saying:"I wore these on a full day hike without once thinking about the fact that half the yarn used to be somebody's old socks."