Ideal for individuals with acute skin sensitivity, our mid-calf allergy crew socks are made from 99.8% organic cotton with only 0.2% spandex in a thin band at the top to keep the sock in place. Constructed to provide a loose, generous fit. We like to say our Allergy Crews fit like a mitten, while our Classic Crews fit like a glove. Allergy Crews have special sizing; see size chart. For a snugger fit, consider sizing down.