Retention Check - THIS TEST IS VERY IMPORTANT. Now fasten the chin strap, so you can check it. After the strap has been tightly fastened, hold your head steady, and note that this test may be a little uncomfortable, but that it is very important. Reach over the top of the helmet, grabbing the bottom edge with your fingers. Then try to roll the helmet off your head. If it comes off, it is undoubtedly too large. Do not use a helmet that can be rolled off the head with the strap fastened! Go to the next smaller size and go back to step number four.
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