Originally Posted by
tzvia
The main thing is to try on many brands/models as the helmet shape varies by manufacturer. Generally, as you go up in price, you get better air venting/cooling, and lighter weight. They will all have to conform to minimum safety standards so don't think the cheaper ones don't protect as well. The helmet needs to fit well to protect well. That being said, there are some new helmet types, like POC, that can withstand multiple crashes, but appear to be geared for MTB riding and don't have as many cooling vents.
Where I ride, it can get really hot so superior venting is worth the $$ to me and after trying a bunch of helmets I ended up with the Specialized Prevail. And it turns out, after years with Giro and L.A.S., the Specialized shape fits me better. My head is not as much roundish as it is kinda flat on the sides and more long, front to back. Giro, Bell, Lazer, Louis Garneau, Mavic and L.A.S. are more round and just not as comfortable. I had used the sizing pads on the sides of my L.A.S. to snug up the fit, I don't have to monkey with anything to get the Specialized to fit me.
Helmets have changed a lot in 11 years. They are much lighter, cool better, and with all the brands out there you should be able to get a good fit. Oh, try not to wait 11 years between helmets, they do age, the materials break down from UV, sweat and being banged around. Most manufacturers advise 3~5 years average lifespan, if they have not been crashed.