Size Guides
Caps & Beanies & Hats
| Nike Hat Size | Head Size (cm) | Alpha Size | Swoosh Flex | Adjustable Unisex | Adjustable Women's | Dual Size Unisex | Dual Size Women's |
| 6 1/2 | 52 | | | XS | S | | |
| 6 5/8 | 53 | | XS/S | XS | S | | |
| 6 3/4 | 54 | XS | XS/S | XS S OS | S OS | | S/M |
| 6 7/8 | 55 | | XS/S S/M | XS S OS | S OS | XS/S | |
| 7 | 56 | S | XS/S S/M | XS S OS | S OS | | M/L |
| 7 1/8 | 57 | | S/M M/L OS | XS S OS | S OS | S/M | |
| 7 1/4 | 58 | M | S/M M/L OS | S OS | OS L | | L/XL |
| 7 3/8 | 59 | | M/L L/XL OS | S OS XL | OS L | M/L | |
| 7 1/2 | 60 | L | M/L L/XL OS | OS XL | L | | |
| 7 5/8 | 61 | | L/XL XL/XXL | OS XL | L | L/XL | |
| 7 3/4 | 62 | XL | L/XL XL/XXL | XL | L | | |
| 7 7/8 | 63 | | | XL | L | XL/XXL | |
| 8 | 64 | | | XL | | | |
