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the correct way to measure the fit helmet: take a tape measure parallel to the temple and go to the back of the head for a week. the data obtained is the correct size to be purchased for the helmet. (be careful not to wrap around the eyes or the of the head) our company specializes in the production of automotive supplies, accessories, and its business scope covers the world our products are directly supplied by the manufacturers, and the quantity is large. quality quality, welcome to order them