Built to shred
I've used these guards for 2 1/2 years now- over three summer seasons. I've done all day sit and spins and 3 day downhill marathons at the bike park. They practically look the same as they did when I first bought them, but that's not to say they haven't seen their fair share of limbs, rocks, crashes, and washes.
They were perfectly comfortable for about two years. Then, this summer, they've just seen too much dirt and sweat and now they chaffe above the knee. Had I been shuttling with them the whole time, I think they would still be perfectly fine, but I hike and pedal all around and even do some trail maintenance with them on to keep the poison ivy and briars off my leg.
They are pretty hot when it's 100F out, but not suffocating. They do hold a lot of sweat and become weighted as a ride progresses and can shift down. I think other guards could be more comfortable against the skin, but the coverage on these seems hard to beat and I like the open back strap design for heat management and ease of removal. Whether or not I try a different set next, I'll still recommend that others try these guards. I've been impressed and they have saved my shin from many of Straitline shin strikes that can usually ruin your day.