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Bike helmets are foam with a thin layer of plastic. The HPV people have plenty of experience with sliding at speed. Kevlar seems to hold up well as would Lexan and Delrin. Motorcycles use hard points to keep bodywork from contacting the pavement. Aluminum honeycomb is used in body armor jackets on motorcycles as it has good crush characteristics. When a bike goes down there is the impact and then abrasion until it comes to rest. Protecting the neck, shoulders, hips, and ankles is key so a sturdy bulkhead is needed just behind the rider. A frontal crash is a matter of absorbing energy and keeping from going head first into some object. Rigid front touring bars can break a leg in a crash. I recommend an inertial reel lap belt .
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