The contour design means the fit Tech fits your chin better, plus the padding and cup are non-abrasive - No more scratching, pulling, or tugging! Metal Buckles Hardened metal buckles won't rust and won't come off. They'll attach to the FIT TECH chin strap securely to your helmet and it will stay there. Contour Design Features a gradual contour in its shape, making it fit more securley and more comfortably to your chin.