What lands here
Kit for work done low to the ground, and for the surfaces you stand or sit on for hours: kneeling pads, supports, and the small cushions that decide whether tomorrow hurts.
Thickness is the whole argument
Too thin and it does nothing. Too thick and you are unstable on a slope. The 4cm closed-cell pad on this shelf is the compromise, and the listing says so rather than pretending there isn't one.