Test Results Linear Impact Testing

Linear Impact Testing*

Wayne State University conducted Linear Impact Testing to examine the severity of impact of blows to head during helmet-to-helmet contact, with Shockstrips and with regular helmets without Shockstrips. Using Riddell Revolution® and Attack® helmets equipped with Shockstrips, 10 tests were conducted at three impact locations; Front, Side, and Back.  All impact was head on, direct to the center of gravity of the head.

The tests measured the two key standards for helmet certification: Head Injury Criteria (HIC) and Severity Index (SI) Testing also measured extra criteria not currently part of the standards for helmet certification: Peak Angular Acceleration (PAA), Peak Resultant Upper Neck Load (PRUNL), and Peak Resultant Upper Neck Moment (PRUNM).


  • Football helmets with Shockstrips perform significantly better than helmets without Shockstrips
    in protecting the head and neck.
  • In all tests, helmets with Shockstrips showed a significant decrease in impact from helmet-to-helmet contact, the Severity Index (SI) and Head Injury Criteria (HIC), the standard measurements in helmet certification.
  • Linear testing performed on helmets using Shockstrips showed a decrease in impact from helmet-to-helmet contact, with 40% of all tests showing a significant decrease in impact.
  • Testing also showed a decrease in loading to the cervical spine.
  • Shockstrips only showed increased values in two out of seven tests for Peak Angular Acceleration (PAA),
    and one out of seven tests for Upper Neck Load (PRUNL) measurements, which are still being researched
    and are not part of the current standard.
  • While no helmet or device has been proven to reduce concussions, Shockstrips provide added padding to the outside of the helmet to reduce impact from helmet-to-helmet contact.

*PLEASE NOTE: 1) No helmet pad can prevent or eliminate the risk of concussions or other serious head injuries while playing sports; 2) Scientists have also not reached agreement on how the results of impact absorption tests relate to concussions; and 3) No conclusions about a reduction of risk or severity of concussive injury should be drawn from impact absorption tests.


Linear Impact Testing Videos - Before Shockstrips

These additional videos, also taken during the Linear Impact Testing of our Shockstrips,
show the difference in impact to helmets before the Shockstrips were applied. Click images to watch!

Linear Impact Testing Videos

View videos taken during testing done with Shockstrips applied to the helmets. Click images to watch!