Ideal weight (heavy enough to stay in place but not too heavy to move). Solid rubber with enough flex to keep it from sliding on the garage floor (the rib pattern helps too). Low enough to fit under my low stroller, but the angle of the face hampers movement (once I forgot to take them off and couldn't turn around. I scratched my head for a second before realizing "oh yeah") . Inspires confidence with car only on two jacks (no tendency to move so don't bother draining oil or inspecting). Really happy with these stockings.