MEASURE BEFORE ORDERING to verify the seat will fit your toilet.
The Potty Scotty Toilet Seat II is designed to fit between the toilet and the ring - thus does not move at all.
Outer Dimensions of Seat that comes up through toilet seat = 8.5" W x 11" L
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.
PHOTO BELOW SHOW HOW THE POTTY SCOTTY TOILET SEAT II FITS ON THE TOILET

The toilet in the photographs is an ELONGATED toilet seat