Generally, the size of your ChinStrap will be the same as your helmet size. For example, if you wear an Adult Medium size helmet, select our S-M ChinStrap. Your helmet may be the ultimate coat of armor on the field, but for added protection and a more proper fitting, you'll also need the right chin strap. Undo all snap buckles from the helmet and remove buckles from the chin straps. Then, pull the chin cup so it slides off the low chin straps to remove.
by M.L. Rose. Adjust your chin strap properly before you play. A chin strap may fasten onto a helmet at either two or four points. Check the chin strap's fit.