Nike Sizing | Hats & Caps
| Nike Hat Size | Head Size (in) | Alpha Size | Swoosh Flex | Adjustable Unisex | Adjustable Women's | Dual Size Unisex | Dual Size Women's |
|---|---|---|---|---|---|---|---|
| 6 1/2 | 20 1/2 | XS | S | ||||
| 6 5/8 | 20 7/8 | XS/S | XS | S | |||
| 6 3/4 | 21 1/8 | XS | XS/S | XS S OS | S OS | S/M | |
| 6 7/8 | 21 1/2 | XS/S S/M | XS S OS | S OS | XS/S | ||
| 7 | 21 7/8 | S | XS/S S/M | XS S OS | S OS | M/L | |
| 7 1/8 | 22 1/4 | S/M M/L OS | XS S OS | S OS | S/M | ||
| 7 1/4 | 22 5/8 | M | S/M M/L OS | S OS | OS L | L/XL | |
| 7 3/8 | 23 | M/L L/XL OS | S OS XL | OS L | M/L | ||
| 7 1/2 | 23 1/2 | L | M/L L/XL OS | OS XL | L | ||
| 7 5/8 | 23 7/8 | L/XL XL/XXL | OS XL | L | L/XL | ||
| 7 3/4 | 24 1/4 | XL | L/XL XL/XXL | XL | L | ||
| 7 7/8 | 24 5/8 | XL | L | XL/XXL | |||
| 8 | 25+ | XL |
