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No. They give fuckall protection and are more hassle than they're worth. If you come off, one dinky strap isn't going to stop your brain bucket moving around on your scalp well enough to let it absorb any energy. Motorcycle helmets are what would be adequate protection for an accident.
>hurr they're not designed for bicycle speeds
Most motorcycle accidents happen below 30.
But proper bike helmets are too heavy and bulky so you don't bother. Either go all in or not at all, not pissarsing around with a plastic kippah.