I have a few new pairs of sneakers that very rarely see the light of day, chiefly because I almost always wear my extremely old pair of New Balance. There's just something about the newer sneakers that doesn't feel right, whereas my old reliable pair seem to fit me like a glove ... er, I mean a shoe.

Wearing shoes that aren't the right fit for you can cause knee pain, back ache, and can even cause permanent joint damage. Besides your level of comfort, you can also tell if a shoe isn't right for you by keeping track of how long it takes you to wear through them. If you go through them quickly, it's likely because it's not right for your foot type. If it remains in good shape over the long haul, then the shoe fits -- so wear it.