This Potty Patty/Potty Scotty Toilet Seat II is designed to fit between the toilet and the ring - thus does not move at all.

It reduces the size of the opening and is shaped like a comfortable toilet seat. The high back will provide support for the child's back and the splash guard in front will prevent messes.

It is made of durable recycled polyprolene.  Outer Dimensions of Seat that comes up through toilet seat = 8.5" W x 11" L (Be sure to measure toilet to be sure of fit - these seats are not returnable)