These genuine sponge-rubber knee pads are ½” thick to provide a good cushion feel and extra durability. The ½ wide straps include durable hinge-activated buckles. To adjust the straps, simply insert the angled end of the strap into the buckle and press the lever down. Once fastened, the buckles hold tight. No hassles with carpet fuzz build-up like with hook and loop fasteners! Good quality and value in a knee pad!