How to measure the right hat size:
First, get out your trusty sewing measuring tape, or if you don't have one, use a longish piece of string or cord.
Wrap the tape or string around your head at about a third of an inch (1cm) above the top of your ears and your eyebrows, as horizontally as possible and without pulling too tight.
The length measured is your hat-relevant head size in either inches or cm (depending on the measurement tool used!).
Tip: If your measurements end up somewhere inbetween two sizes, always go for the larger size.
More advice: If you wish to give a hat as a gift and don't know the recipient's head size, you can always try a kind of 'parlor game' to see who has the biggest head - use a string to compare and discretely keep the marked string to examine later for an exact measurement!
Standard hat sizes:
| 53cm | 20¾" | US 6 ⅝ (XS) | XS | |
| 54cm | 21"| US 6¾ (S) | S | |
| 55cm | 21½"| US 6⅞ (S) | ||
| 56cm | 22" | US 7 (M) | M | |
| 56cm | 22" | US 7 (M) | ||
| 58cm | 22¾" |US 7¼ (L) | L | |
| 59cm | 23" |US 7⅜ (L) | ||
| 60cm | 23½" | US 7½ (XL) | XL | |
| 61cm | 24" | US 7⅝ (XL) | ||
| 62cm | 24⅜" | US 7¾ (XXL) | XXL | |
| 63cm | 24⅞" | US 7⅞ (XXL) |