CoreFlex flexible material under entire seating surface allows seat to adapt and conform to each user's sitting position; KOHLER Cymbal toilet seat has a 20% wider sitting surface than standard KOHLER toilet seats Wider toilet seat surface provides increased support while maintaining the same opening as a standard model, while the Quiet-Close round soft close toilet seat prevents slamming CoreFlex flexible material in the center of the seat adds modern style and blends seamlessly with the rest of the soft close round toilet seat; ReadyLatch hinge provides a positive lock/unlock latch to securely hold seat in position Grip-Tight installation hardware makes it easy to fasten the toilet seat – everything is done from above the bowl, and Grip-Tight bumpers hold it firmly in place Color-matched plastic hinges and single hinge cover simplifies cleaning