The 661 Comp Elbow Guard offers the ultimate in protection with external Polypropelene caps and a padded ventilated chassis.
XC rider. I haven't tried other arm guards but I like these a lot. Sizing felt off, I don't have big arms but L was tight - and the straps were long. This was the previous style straps. I will update my review when I get the newer ones. I like the shells over soft pads. I crash more than I should and these have been great.
It's nice to know that if you fall and instinctively put your arm out that you won't break it on your handlebar. Almost did that and bought these to prevent it.