Smartwool Hike Classic Edition Full Cushion Second Cut Crew Socks Purple Iris Extra Large. They're made out of old hike socks. Yep Smartwool Hike Classic Edition Full Cushion 2nd Cut Crew Socks are made with a mix of recycled fibers canister waste and virgin Merino wool for a pair that feels good and does good with every step. Plus the full cushioning helps add extra warmth durability and protection making them the perfect pick for colder weather hikes. Specifications for Smartwool Hike Classic Edition Full Cushion Second Cut Crew Socks: Manufacturer: Smartwool Gender: Unisex Age Group: Adults Sock Height: Crew Footwear Type: Socks Activity: Hiking Seasonal/Temperature Use: Winter Fabric/Material: Merino Elastane Fiber Nylon Features of Smartwool Hike Classic Edition Full Cushion Second Cut Crew Socks Featuring Smartwool 2nd Cut yarn utilizing a mix of 50percent recycled fibers from a combination of Smartwool sock take-back program and canister waste and 50percent virgin Merino wool to create new socks Package Contents: Smartwool Hike Classic Edition Full Cushion Second Cut Crew Socks Smartwool SW002786L9010XL000: Hike Classic Edition Full Cushion Second Cut Crew Socks Purple Iris Extra Large