"I take it from that statement that my old 1997 AGV Polycarbanate helmet still in it's box and unused should be thrown out then?  "
No don't chuck it, it is the exposure to UV and sweat that damages the helmet, so it really should be 5 years use.I suppose 5 years in the atacama desert is not the same as in the yorkshire moors.
Having said that a 2008 helmet may be better than a 1997 one, somebody must have learnt something in the last 10 years......
Ch
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