Hush Heels are precut closed cells foam pads, with various shapes, to be pasted on actors soles to muffle footsteps which modern don't like . Of various shapes and sizes, for the heel, the tip, or the sole, these pads are quite suitable indoors but hardly suitable outdoors.
The foam is relatively non-skid, so it can generate screeching noises on very smooth surfaces such as wooden or laminated floors.