“I unsnapped my chinstrap and removed my Kevlar helmet, balancing it on the muzzle of my rifle.”
“I don't think Reggie had his chinstrap fastened, and as Jackie Slater was blocking him, Reggie's helmet fell down over his face.”
“As Pedregon approached the end of the track, his chinstrap came off, forcing him to get off the throttle.”
chinrest
(music) A shaped piece of wood, plastic, etc. attached to the body of a violin or viola to aid in the positioning of the player's chin against on the instrument.