Bests & Worsts Reviews from Amazon

I have never had knee pain (played competitive soccer for 20+ years or while running). At age 32, I ran my first marathon in San Francisco and was training about 5 days a week. I started getting runner's knee when training got up to at 16-18 miles (approximately 3-4 weeks prior to the full marathon). I stopped running for approximately 3 weeks. I started wearing these as I started working my mileage back up and I also started to do quad exercises and foam rolling more frequently. While I can't say with certainty that there's any proof that these things helped me, what I can say is I wore them for the full marathon and only had a little chafing on my medial knee area and I didn't notice the chafing until mile 20. Enclosed is a picture of them at mile 25.