I was going to make a science joke, but all the good ones argon. These socks with scattered formulas, molecules, are a chemists dream.
Medium: (Men's 4-8 / Women's 5-9)
Large (Men's 7–12 / Women's 8–13 Shoe)
Machine wash, cold (30 °C / 86 °F). Do not bleach or iron the socks. To reduce damage, line dry. They will last longer if you keep them out of the tumble dryer.