Figure 4. .
Gadd Severity Index scores (mean ± SD) measured for helmets with or without Guardian Caps at high velocity (5.47 m/s). A, Riddell Speed (Riddell Sports, Elyria, OH). B, Xenith X2E (Xenith, Detroit, MI). C, Xenith Epic.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.