Go to the largest motorcycle accessory store that’s available. Test fit the helmets that you are interested in. Put them on, take them off, work the shields etc. Wear them in the store for 30 minutes. Different helmets in different sizes will not fit the same. Luckily we have Iron Pony here in Columbus. They have a huge helmet selection. You’ll see people walking around wearing helmets while shopping. Just like you would sit on a bike that you’ve never been on before to see how it feels after a half hour or so..