28″Wx20″D Ensolite® Race Track Oval Seat (7.75″Wx12.75″D opening, 1.5″ foam)
Ensolite® seating may offer the potential for a dual density foam. Allowing air to move in and out providing a softer seat for a little more give.
The racetrack style opening: equal width across the front and back and straight sides connecting them. May provide an opening that is deeper. This could be able to accommodate different clientele depending where the additional weight is carried.