Quote Originally Posted by CAS View Post
Does anyone know if--after a couple of years--a helmet needs to be replaced (if it has not been damaged)? I heard (not certain if it's true) that the materials (ie foam) can break down over time. Thanks for any input!
Short answer: Yes.

Long answer: Most, if not all, helmet manufacturers suggest replacing your helmet every 3-5 years. The foam stuff they use breaks down with small bumps and knocks, exposure to UV light, oils in your skin, sweat, heat (like leaving it in a hot car for a while kind of thing), and it does dry out over time. 3, in most places, is excessive. (Unless you live in the Southwest.) 4-6 years is probably a more realistic lifespan for a helmet than what the manufacturers say.