Depends, (no not the diaper). Wool does last long and it does an excellent job of wicking plus it doesn't stink anywhere close as bad as the plastic clothes. But the price can be a bit standoffish, so I have one that I use for long rides and then I use the plastic stuff on short rides. I did see a wool base t-shirt at Walmart SuperCenter that is mixed with modern plastic for $24 so I was contemplating trying it to see it's any good.