Hot answers tagged helmets
I sweat easily and am in shape however I do the following (and this may repeat what others have advised, while the difference is, I do it daily an experience it - I am in Toronto, so the weather is also getting warm): I currently ride in jeans and t-shirts (see below).. I ride where my body temp doesnt get too high...its very tempting to race or keep up ...
A motorcycle helmet will be too hot and heavy for cycling. Spend $20 USD and get a cheap bicycle helmet - you'll be a lot more comfortable and happy.
I think you are concerned with the 'rate of degradation'. I've designed sports helmets recently that use similar materials (EPS for example), but not for so long as to ascertain all aspects of durability. Your biggest concern would be loss in mechanical strength on photodegradation. The rate of change in the mechanical integrity of expanded polystyrene ...
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