I cant help you much with the under suit question, but I do have some warnings for the helmet. When I first started the forums this was a common topic. The general consensus was that no matter how well made and sturdy our helmets are, we should never use them to replace a tried and true motorcycle helmet. I know this makes me sound like a major kill joy, but these suits are primarily for looks, not seeing which one can endure the greatest beating. I hope you are able to get some better advice on your actual suit. Best of luck.