"Full Cushion wraps the Hike Classic Edition Second Cut Crew Socks in extra padding for winter miles, adding warmth, durability, and protection a lighter sock can't match on rough, cold terrain. Smartwool's 2nd Cut yarn spins that cushioning from a blend of recycled fiber and virgin Merino wool, holding up to the same standard as a fully virgin-wool build. Three pairs are included, enough to keep a cold-weather hiking rotation stocked. What Our Gearhead® Experts Are Saying:""I've kicked through scree and half-frozen mud in these, and the extra cushioning doesn't just keep my feet warm, it keeps the sock intact where a thinner pair would've worn through by lunch. That extra layer under the heel and ball of my foot is doing real work against sharp rock, not just padding for the cold."""