Toilet seat assembly

A toilet seat assembly comprising:

• a toilet seat comprising an inner rim around a central opening of the toilet seat and a contoured upper seat surface that extends between the inner rim and an outer rim of the toilet seat;
• and
• a lid hinged to the toilet seat and movable between an open lid position and a closed lid position with respect to a toilet bowl and the toilet seat;
• wherein the lid comprises an inner liner that comprises a shaped surface portion and a core portion, the shaped surface portion is shaped to correspond to the contoured upper seat surface of the toilet seat, and the core portion is joined to the shaped surface portion at the inner rim of the toilet seat, and in the closed lid position the shaped surface portion of the lid covers the upper seat surface of the toilet seat, and the core portion of the lid covers the central opening of the toilet seat and extends down past an upper edge of the inner rim,
• wherein the toilet seat assembly is configured such that, when the lid is in an open position during a flush cycle of a toilet configured to flush from 0.8 gallons to 1.6 gallons per flush, an open-position-air-inflow flows in through the toilet bowl and an open-position-air-outflow flows out through a clearance of the toilet,
• wherein the toilet seat assembly is configured such that, when the lid is in the closed position during a flush cycle of the toilet configured to flush from 0.8 gallons to 1.6 gallons per flush, a first closed-position-air-inflow through the toilet bowl is reduced by 40% or more compared to the open-position-air-inflow, and a second closed-position-air-inflow flows in through the clearance of the toilet.