The Flexi-Fit Toilet Trainer from Pourty has a unique squeeze flex action and adjustable prongs so that it fits securely on to the toilet seat. Adult toilet seats come in many shapes and sizes and most potty seats have no size adjustments. This means that they can wobble around making the child feel insecure when they sit on them. The Flexi-Fit's clever design allows you to adjust it once per toilet seat for a great secure fit each time. Its squeeze flex action enables you or your child to put it on and off the toilet easily.