It's the number that tells you if the shoe fits without turning you into Cinderella’s stepsister. It’s like a secret code for your feet, but with less mystery and more "Will my toes be squished?"

Calf circumference is the measurement around the widest part of your calf. It's like a hug for your leg, but with a measuring tape instead of arms.

Socks length is how tall your socks stand, from toe to top. It’s like measuring the height of a mini-skyscraper, if the skyscraper was made for your feet.