Adidas Casual Beanie Red Knight Ruby Ruby Japan Men's Hat, BR0813, F17/Mystery F17/Mystery F17, OSFZ-(Free Size)

OSFC: 51-54cm, head circumference 51cm OSFZ: 54-57cm, head circumference 54cm OSFX: 54-60cm, head circumference 58cm OSFL: 60-63cm, head circumference 60cm [CLIMA WARM] With excellent heat retention and breathability, it helps maintain the ideal body temperature (37°C) for exercise.