To determine helmet size, carefully measure your head with a cloth tape measure. For greatest accuracy, measurement should be taken by someone other than yourself and the tape measure should be held snugly around head. Place measuring tape completely around the widest portion of your head approximately 1" above the eyebrow, just above the ears and at the point on the back of your head that will give you the largest measurement. It is best to take several measurements and to use the largest one to determine head size. Find your head size in the correct chart, then order the corresponding helmet size and stock number.

These are item #'s CBF331825 and CBF331827, respectively. Enter the item mumbers directly into the search box and these will come up. Hope this helps!