Nike Headwear Size Chart
| Hat size | Head size (cm) | Head size (in) |
|---|---|---|
| S/M | 52 – 57 | 6 1/2 – 7 1/8 |
| M/L | 55 – 60 | 6 7/8 – 7 1/2 |
| L/XL | 58 – 63 | 7 1/4 – 7 7/8 |
If you're on the borderline between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit.
How to measure
Measure the circumference of your head using a tape measure. Wrap it around your head at the point where the hat will sit (about 2.5cm above your eyebrows).