I bought socks with a lifetime warranty. I questioned how that was
possible, since socks obviously wear out in a year or so. They told me that
when that happened, they would be replaced, repeatedly and forever.
I got them replaced about 3 times, when the store cancelled the warranty.
When I made an issue out of it, they can't arbitrarily cancel a lifetime
warranty, they gave me my money back.
Well, free socks for a few years; not too bad.