Obviously this design is much too large to be practical. The circumference is bumped up to 45cm. (Perhaps more if we added MIPS.) The weight is a problem, in particular because the bulk of it is above the head’s center of gravity where weight is most bothersome. Vents would not work well, if there were any. But most importantly, in a crash the leverage this helmet would exert on your head and neck would be increased dramatically by that thicker foam, upping the dreaded rotational energy to the head and perhaps making it not an anti-concussion helmet at all.
There are two assertions that have to be investigated:
- Bicycling is inherently safe. It never requires the use of a helmet because it is a non-concussive activity that does not warrant a helmet. Helmets are a contrivance being pushed by the bicycle manufacturers.
- Bicycles have the highest rate of head injury among all sports!