Have the grey/red ones. Great braces. Sadly, I got to test them in an incident a couple months back. Front wheel deflected on a rock up a hill at moderate speed, bike went left, reflexively tried to save it by putting my left foot down, only my foot was almost at 90deg to the bike. Without the brace, I would have hyperextended my left knee to the left thus ripping the MCL (the inside ligament of the knee). Instead, the brace prevented any sort of hyperextension, resulting in a vertical hit up the leg, compressing the knee and likely (I say likely cause I never bothered getting an MRI) causing a small tear in the meniscus. Knee swelled up and orthopedic pull blood/fluid out of it. According to the doctor, it's a better outcome of the incident. I stopped riding for two months and took it easy with stairs etc, and the knee is 95% back to normal now. Highly recommend these braces!