I’ve done about 12 rides with these so far and I haven’t yet hit anything really hard, but I’ve no doubt they’re up to the task. The material protecting the Rheon is super tough, and I appreciate the flank protection. Ridden a few long days in hot weather, and I forgot they were there after a while, and they haven’t slipped. The grippy material on the inside cuff is super skookum. I was a bit concerned the rough knee fabric would catch on long/DH pants, but it doesn’t. So far they’re the best knee pads I've owned.