The Gen 4 S1 Pro kneepad is carefully designed for comfort, durability, stability and function. We have taken great care in the design and development of this product and are very excited to make our vision a reality. Years of development and thousands of hours of wear testing, we are very proud to present the Gen 4 S1 Pro Knee Pad. The Gen 4 Pro kneepad is exactly the same in terms of design, function and size as the Gen 3 knee brace, with the only changes being seam reinforcements at each of the strap's contact points and a new layer of foam reducing strain. shocks added to the inner knee pad.