Most popular chinstrap compatible for Riddell SpeedFlex helmet featuring redesigned vent holes and foam interior Polycarbonate exterior with comfortable foam interior Includes Cam-Loc assembly piece with slideable straps SIZING: When selecting your adult or youth football chin strap for helmet, match Speed flex chinstrap size to helmet size. Fits both youth and adult helmets. NOTE: Thumb screws not included on the football helmet chin strap With increased air flow and a more comfortable fit, the Sports Unlimited SpeedFlex Hard Cup Cam-Loc Football Chin Strap 2.0 makes the best helmet in the game even better. Fitted with a foam interior and polycarbonate shell, the chinstrap offers a comfortable option for players looked to upgrade their standard soft cups.