How to know your size when order the helmet ?

hi,everyone :

do you have a motorcycle, do you want to replace your helmet now ? yes, your helmet should be replaced if it had been used for 5 years or more , or it had been involved in a accident ! it is necessary ! but how do you know your size, please ? how to make the new helmet fit you , protect your safety and make you comfortable, reading the folling, please :

To find the right size, use a tape measure to measure around the largest portion of your head –– about 1 inch above your eyebrows. Look for a helmet that matches that measurement.

Once you have found the right Gerneral size, It's time to make the helmet fit you, Normal, Helmets have a remarkably verstile fitting system that includes sizing pads and adjustable straps, A good-fitting helmet should be snug, not too tight, not too loose,It should sit level on your head ( not tilted back ) with the front edge, no more that one inches about your eyebrows,Push the helmet from sizde to side, and back to front. If the helmet shifts in any direction,using the sizing pads to snug up the fit. Next, buckle and tighten the chinstrap, Push up on the fron edge of the helmet, then up on the back edge, if the helmet moves significantly in either direction,tighten the chinstrap and try again, Finally, with the strap buckled,open your mouth, If the helmet doesn't press firmly down against your forehead as you do so, tighten further and repeat  !

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