a padded toilet seat lid is made by magnetically induction welding to the upper surface of a plastic lid shell , a plastic frame which surrounds a cushion providing the padding . the frame traps a peripheral margin of the cushion against the upper surface of the lid . the cushion is also secured to the lid by a pressure - sensitive adhesive . welding of the frame to the lid is accomplished in a special fixture that supports the lid and cushion upside down .