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My head, ear to ear, measures about 188 mm, while this helmet shows to be about 176 mm at its widest point, excluding the ear pieces. The main helmet part fits, though obviously it's a little tight. I can't put the helmet on with the helmet_rev_2 piece on because it narrows the opening to about 140 mm, and I had to hollow out the ear pieces in blender to give room for my ears.