Composition: 66% merino wool, 4% nylon, 30% lycra spandex
Be gentle. Either hand wash or machine wash in cold water on the gentle cycle. If using a machine, it's best to place them in a laundry bag to protect them further just like other delicates. Use a mild detergent and never use bleach or fabric softener.
Turn your socks inside out. This way, the extra cushioning at the soles and heels will get a more thorough wash.
Do not use a dryer. The heat and circulation of a dryer will decrease the longevity of your socks. Best to air dry them on a drying rack.
Do not iron. There's no need to iron socks, and it's especially important to refrain from ironing those styles with silicone grippers (flow and chill).