SIZE: MEDIUM Medium (M) = head circumference of 56 - 58.5cm HOW DO I KNOW MY SIZE Discover your size with a measurement tape. Position the tape above your ears and exactly around your head where you want to wear the hat's brim. ONE-SIZE-FITS-MOST Sandoval hats have an elastic inner band which allows our M and L hat sizes to fit multiple head circumferences. The elastic band conforms to your head circumference and provides extra wearing comfort. FREE HAT SIZE REDUCERS If your size is around 55.5cm, we can offer free foam hat size reducers that reduce the Medium hat size to 55.5cm. Just mention your request in the order details. Timeless Elegance in Gray: The Rivera Gray Wool Felt Hat is a masterpiece of fashion, offering a classic and versatile gray tone that pairs effortlessly with a wide range of outfits.