SLIP RESISTANT DESIGN: this mat is uniquely designed with hundreds of spikes on the underside to help it stay in place on your low pile rug without slipping or sliding; before using mat, test with foot to ensure it is securely in place and doesn’t move WON’T BEND OR CRACK: this heavy duty sturdy design is incredibly durable and meant to last for years; third party tested our mats can support up to 400 pounds; at over .