Buying bike helmets

Hi


I need a new bike helmet and I want a good one. Good is not a price but maximum safety, ventilation, fit, and somewhere in between a "look." I spent at least an hour trying on helmets today.



My questions:



1. Except for the obvious (one's for mountain biking; one's for commuting), what's the structural and functional difference between mountain bike helmets and regular city and road biking helmets? I liked the Giro Hex and now I find it's a mountain bike helmet when I'm a commuter.



So what's the diff? Maybe I shouldn't get it if I don't mountain bike.





2. Why are the straps so chintzy on bike helmets? Little ribbon things. My ribbons started losing their chintzy plastic hardware, which started me on the new helmet search. Is there a brand with good strap things?



3. Now they tell me my 10-year-old helmet's foam has surely lost its moxie. I think my helmet's foam is perfectly good. How would one know? Also, what about the new types of foam?



Any recommendations on that?





Please help.



Thanks!



I didn't find the right solution from the Internet.





References: able2know.org/topic/116222-1



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