two plastic layers joined at opposite edges to form a tubular structure in use the covering material fits snugly around the toilet seat yet is sufficiently loose to be advanced around the seat without tearing fig1 illustrates an assembled improved hygienic toilet seat in accordance with the present invention the major structural components of the assembly include a base member 1 a top cover 2 a seat 24 and a mounting bracket 16 as assembled base member 1 and top cover 2 form a housing for protecting various internal components including a motor subassembly 13 and electronic circuitry not shown in fig1 the improved seat assembly further incorporates heat shrink wrapping 55 over the motor subassembly to prevent potentially harmful agents such as cleaning chemicals from deteriorating motor subassembly components an activation button 5 is exposed through an opening in the top cover 2 a standard key lock 17 is provided for locking the top cover in place in operation the activation button is manually depressed to advance the sanitary covering a sufficient length to provide a fresh seat covering a mounting bracket is provided for attaching the unit to the base of a toilet end caps 3 extending through aligned circular openings in mounting bracket 16 and base member 1 allow the entire seat assembly to.