New Moto Guzzi Door Mats Available Now
Supposedly, much of the reason for a helmet needing to be replaced in a prescribed number of years, is the crush material between the shell and the fabric liner. It degrades over time, and becomes more brittle, with less ability to absorb energy.
I bought my last couple of HJCs for $120 or so, no sticker shock. End of issue for me - I buy them every few years, it’s hardly worth replacing the visor versus buying a new one.
foam does crumble as it gets old.
Now the important question yet to be asked...what do you do with an old helmet? Dumpster, recycle (where?) flowerpot?
It isn’t justified.
I don't think anything on a helmet evaporates or degrades like, say, a bike tire.Lannis