The protection offered by this DERBYSTAR knee may seem, at first glance, good quality: upholstery seems thick, the knee holds quite well the knee. Except that, after several months away, padding really less protective, outer tissue spoils very quickly, especially in the middle of the protective square.
Moreover, the toggle poor resistance to washing (in hand of course) which does not contribute to a long life of the product. In short, knee pads are cheaper than you will change more often, or opt for better knee that you will not change much, but avoid these!