Another Helmet thread

[midden]

Thanks midden for that but im reading it and thinking none of that applies to me as its only ever had water to clean it and is still a good fit and not had much use.
What I am seeing here is kind of (not you lot ) wishy washy guidelines mainly from manufacturers, who want me to buy a new lid every 3 years. I suppoes that they do not want to get into issues that giving a set time would bring if one failed under that time.
I don't do fashion and I wonder how many people are swayed to by a new lid based on the latest design and using the 3-5 year manufactures guidelines as an excuse to get a new lid rather than any age/ safety related issue

nick crisp could you point me in the direction of your IS-17 review please

I think I read it different to you. 
It suggests to me (quite clearly in fact) you don't need to change your lid. Obviously don't hold me accountable, but I wouldn't change mine either.