first off I want to say, glad Nick is going to be ok. now onto the use of a helmet. I googled why fighter pilots wear a helmet. this is what it said, I agree.
A helmet provides head protection. A fighter airplane can make many sudden turns and a helmet provides reduction of the risk of a head injury. If the pilot needs to eject the airplane, helmet is needed to protect from wind blast, in addition to what I mentioned #1. Helmets play an important role in noise attenuation.

so I asked myself why would I need one. not for banging my head on the side when doing a turn, never had that problem. not for ejection, there's no way to fit an ejection seat in the kitfox.

noise reduction, no, I have a bose a20 that is pretty quiet.
so I guess I can save my money because I would probably hit the top anyway or the braces on the side all the time with one. so no fighter pilot with this guy.