hello all very new to the boards and prop building in general i have read over the boards and used search but i couldnt find an answer. i went out and bought a skateboard helmet today and thougt it might be a little to small. so i got home and printed out the pages 5-6 that have the dome form on them and turned out there kind of small. i measured it and its 8.5 front to back and 7.5 side to side. it seems to fit on my head but theres not much room for. padding ect.. and the helmet i got was way bigger. so is 8.5x7.5 the size the dome should be. im sorry to be a pain my first post. but thnks for any help.. glenn