lernrwrote a review of Alpinestars Moab Knee/Shin Guard on October 30, 2011
Great product, great fit.
However, I haven't really tested performance as I only wore them a couple of times and was conservative so didn't take a single spill... Originally I planned to use them for snowboarding park too, but didn't realize the shin protection will interfere with the boots. Plan to keep them and buy something else for snowboarding