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Feature 1

Tighten the back of the helmet.

Check to make sure the helmet does not slide around with head movement.

Feature 2

Make sure there is a gap about two fingers wide between the front of the helmet and the brow. 

Anything more or less is not acceptable. 

Feature 3

Ensure the chin strap is not too loose or too tight. If two fingers can fit under the chin, the strap is perfect.