QEP Black F3 Stabilizer Knee Pad, Fits And Flexes To Keep Your Knees Protected During Every Job. The Xl Patella Gel Zone Combined With The 6 Layer Comfort System Conforms To The Shape Of Your Knee For A Custom Fit. They Also Feature A Pillow Comfort Memory Foam And The Support Of 10 Power-flex Support Pads For Added Comfort. These Knee Pads Also Feature Independent Stabilizing Feet That Give You More Stability But With Less Contact.