The Leatt AirFlex Pro knee guards are a fantastic product! If you have never seen or used Leatt products before, you should know that Leatt has an attention to detail that is next level and these knee guards are no exception! The thing that stood out to me the most after using this product for a complete race season was the exceptional comfort on longer rides. Many other knee guards that I have used offered a similar level of protection but were much less comfortable due to the of the lack of ventilation. Leatt utilized ventilated non Newtonian impact gel on the face of the knee guards to help make the knee guards as cool and comfortable as possible without sacrificing protection. One of my other key points about these knee guards is how well they stay in place. I have had issues with other knee guards moving around quite a bit and not staying where I wanted them. Leatt used a ergonomically shaped patella cup with silicone anti slip material to help keep the knee guard right where it needs to be! I am 5’11” and 195 lbs and the size XL fit is spot on for me. As far as durability goes, they are holding up well after a complete race season of use and multiple wash cycles. IMHO this product is a great example of the outstanding engineering that Leatt uses in its products! If you are considering some new knee guards for trail, enduro, or even some pedally downhill level rIding, grab a pair of these. I highly recommend the Leatt AirFlex Pro knee guards! L