Thick & Wavy hair: LARGE. It provides a wide strong base (like a pyramid) to balance and evenly distribute the weight of your thick hair. Thick & Wavy Curly Hair can also wear MEDIUM for sections—like Half up Half down, Ponytails, and small buns! Sleek, Thin, or Fine: Choose MEDIUM. It provides a wide lightweight base that you need to lift your finer texture hair.