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At the 28 schools in the local survey, more than 40 percent of the 2,330 helmets this season were rated 5-star, or "best," up from 25 percent two years ago.
"If you look at football in 2017 compared to football in 2011, it's drastically different," said Stefan Duma, a biomedical engineering and sciences professor at Virginia Tech University.
With a properly fitted helmet, the top of the head is separated from the helmet shell by a uniform, functional, shock-absorbing support lining.
Daily evaluation of this support mechanism, including cheek and brow pads, for placement and resiliency should be taught to players.
Locally, parents say they are aware of helmet safety standards but rely on the schools' athletic departments to comply with them.
"I'm completely confident that my boys are safely equipped and know the correct way to tackle," said Celeste Lomax, who lives in Washington Township, Gloucester County, and has two sons, junior Brad and freshman Chase, playing football at St. Joe Lauletta, of Exton, Chester County, is the father of Downingtown East senior quarterback Bryce Lauletta.