Headgear models worn for the study
| Manufacturer, model | Females (n) | Males (n) | Total (n) |
| Full90 Sports, Premier (Full90, San Diego, California) | 230 | 155 | 385 |
| Forcefield, Ultra Forcefield Sweatband (ForceField Protective Headgear, Great Neck, New York) http://www.forcefieldheadbands.com | 364 | 136 | 500 |
| LDR Headgear, Soccer Headband (Leader Headgear, Fond du Lac, Wisconsin) www.leaderheadgear.com | 2 | 1 | 3 |
| Storelli ExoShield (Brooklyn, New York) www.storelli.com/exoshield-soccer-headguard.html | 363 | 159 | 522 |
| Unequal Technologies Halo 10 mm (Unequal Technologies, Glen Mills, Pennsylvania) www.unequal.com | 72 | 23 | 95 |