 
| Excerpt from: Happenings
|  | | October 15, 2008 | | SHARP Ratings Out for Many Makes/Models in Europe | One thing we all do in California (and almost all do in other states) is buy a motorcycle helmet. Interestingly, there is almost no information out there on how this should be done.
In the UK, there is a newer and more comprehensive study of helmet performance. Instead of the old system, which measures damage to the helmet, the SHARP program measures how much impact is absorbed. Helmets are rated on a scale of one to five stars, so that you can know what you are buying.
Although in many cases the helmet models (or designations) are different, it is well worth looking at the SHARP results before buying a helmet. For one thing, there is a striking disconnect between price and performance in most cases.
Helmet outer shells need to be hard to distribute the force of a blow. The harder, the better. Polycarbonate is the cheapest and the worst, fiberglass in between, and carbon fiber the hardest, and therefore, best (but most expensive).
The liner should be dual density foam, because the foam should be a soft as possible, but not so soft it compresses all the way to the liner. If too dense, it won't compress enough. Therefore, the best way to balance the density seems to be different density foams.
Another important feature is that there be protection on the inside of the chin bar. Almost 40% of impacts to the helmet are in the area of the chin bar, so it needs to be padded. Further, this area is opposite the neck, so you don't want unnecessary transmission of force to the neck. Remember, there is no bone connecting the head to the spine, so this is a structural weak spot in the body.
This discussion should narrow down the choices. You want a full face helmet, from a manufacturer with good SHARP ratings, preferably in a model that got a 5 star rating. Otherwise, get a model that is the same as one with a 5 star rating.
Next, make sure the fit is snug, and that you can fasten the chin strap reasonably tight. The helmet can't do its job if it flies off. Try to find a helmet that fits the shape of your head.
Of course, the more comfortable the helmet is, the easier it is to wear, and the more attention you can pay to other things.
Last, go for good graphics, provision for sound equipment, and whatever else floats your boat.
I'll keep re-visiting this important topic from time to time. Your brain depends on the right choice.
Lastly,
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