German motorcycle helmet construction has come a very long way from the WWII-era M35, M40, and M42 combat helmets from which they descend. Typically, bikers choose a helmet based foremost on price, followed by looks, comfort, and safety – in that order. As far as a modern DOT approved German motorcycle helmet goes, the classic shapes of the M35, M40, and M42 combat helmets remains unchanged while both the comfort and safety factors come from a whole new world.
To get an idea of the advancements a modern German style motorcycle helmet, DOT-compliant ones at least, offers today's biker, take a look at these two photos:

As you can see, the original WWII-era German helmet uses a simple leather web liner on the inside. While a leather web liner may offer comfortable wear and easy re-sizing, it obviously isn't going to provide any suitable protection for the rider's noggin during a serious spill.
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