soft padding

noun
  1. Material used to cushion or protect an object, typically made from a soft, compressible substance. noun
    The helmet has soft padding inside to protect the head during impact.
    She added soft padding to the chair to make it more comfortable.
  2. The act of adding a soft material to cushion or protect an area or object. verb
    The workers were soft padding the walls to ensure the room was soundproof.
    He spent the afternoon soft padding the seats for the new theater.