If a sufficiently absorbent towel, cotton etc is not place inside the training panties, the panties cannot keep the liquid. 2- Training panties are not diapers. Parents should not wait for the child to pee several times but change the panty when wet. Luxury Training Panty: The interior of the luxury training panty is absorbent towel fabric. The second layer is polyurethane membrane that lets the air in but stops leaking and the exterior is cotton fabric with panty appearance. The towel fabric in the inner level is added another absorbent area supported by fiber. Thus the peed area will keep the pee. The leg area is manufactured from a special rubber to prevent leaking. Does not contain PVC or harmful materials. No 1 1-15 kg, No 2 15-20 kg. Can be hand or machine washed.