Made from heavy duty 680g PVC with HF welded seams.
Replaceable, anti slip, elastic webbings and side release buckles for adjusting.
Replaceable 10mm closed cell foam pads (may fit up to 20mm).
Clever idea of running a rubber gripping seam around the webbing to hold the knee pads in place.
They come with a rather thin piece of plastic sponge for cushioning but I added in 10mm of neoprene too which the knee pads are designed for and they were certainly comfy but I'm not sure the straps will hold out for long, they are held in place by a little piece of plastic rod which jams against the eyelets and I think that will give up first. Excellent for the price.