Description: Gentle elastic at waist for a comfortable fit. Easy to pull up and down. it is waterproof at the buttocks area. Inner meterial is 85% cotton & 15% polyester towel cloth with TPU film . The training pants are designed in this way to do potty training. Attention: once your baby told you they have wet themselves, you should change them as soon as possible, as these will only hold the wee for a few minutes before leaking around the legs!