My Leki Thermolite XLs finally arrived today (almost two weeks after ordering them at the local) and I can't wait to use them. The outer side of my left knee kills me when I walk downhill...and I'm only 34! I figured the poles and maybe 50 lbs of weight loss (still waiting on that one) will help tremendously. I ordered the XLs for the extended foam padding so I don't have to re-adjust every time I go uphill.