The 600D polyester fabric cap is good for delicate surfaces like hardwood or laminate flooring and other applications where sliding is necessary. The heavy-duty elastic and hook-and-loop closure allow for easy on-and-off.
I have owned three pair of AWP kneepads. The first pair was camouflaged and wore very well for several years before the Velcro finally gave up. The gray and black pair wear extremely well, the Velcro works very well. The pad is just wearing thin in the middle right where the knee meets the ground. I use them almost daily and get several years use out of each pair. These are not for tilesetters or people who are constantly on their knees, but for those who kneel periodically during the course of the workday or puttering around the house.