This is the right way to put on a helmet. You don't need to undo or adjust the strap every time.
Before a ride on my screaming motorcide-ickle I check the ballistic chute, nitrous tank, etc. Then I look up to see if my passenger is ready. Usually they are still messing with their helmet strap or trying to pound the helmet over their head.
Apparently the proper technique for putting a helmet on isn't widely known. So here it is.
Skillfully demonstrated by Numberandom