These are waterproof pants and a waterproof skirt (with snaps) for preventing bedwetting that I took with my daughter when she was small on a trip. I put them on her, but she never leaked, and she only wore the skirt type over her pajamas. I recommend them for trips or nighttime use, when you don't want to get wet! There is no specific size, but I think they would fit roughly from age 2 to 3, which is the typical potty training period. I washed them after my daughter wore them at home and then stored them. Please understand that they have been worn once and the tags have been removed. #PottyTraining #WaterproofSheet #BedwettingPrevention