Tackling Dummywrote a review of Alpinestars Paragon Plus Knee Protector on August 30, 2019
Familiarity: I've used it once or twice and have initial impressions
These pads are quite good. Lots of protection for lightweight pads. They do have a CE certified protection rating so you know that they can take a punch. At first when I put them on, I was a little worried about the comfort because the pad itself is so stiff and stout but after riding those concerns went away. The pads were not on my mind the entire ride. The pads are quite flexible while pedaling. The rest of the pad is made with a lightweight breathable mesh. They stay put very well and haven't slipped on me. The longer length is very good, so it covers up your ugly thighs. Sizing seems spot on.
My only improvements would be to have a silicone strip on the bottom to help with retention as well. Also, it seems like the pad is super stout but the mesh is on the lighter side. Seems like the material could be more stout to match the pad, but the material may hold up well to long term abuse. We will see.