The Nighttime Trainer features 4 super absorbent layers of bamboo fabric in the wet zone and a waterproof layer to prevent puddles, the perfect combination for children new to potty learning or those that need a little nighttime protection. The stretchy waist and legs allow your child to easily pull the trainer up & down on their own, giving them confidence and independence in this new stage of their life. The natural fiber interior allows your child to instantly feel when they have had an accident which will help them better understand when they need to use the toilet. While our trainers do have a waterproof layer to help prevent puddles, they are not intended to replace a diaper. The Nighttime Trainer will hold an average accident but will need to be changed immediately. If the trainer is left on too long after an accident, if the child is sitting when they have an accident, or if the output is greater than the absorbency capacity, some urine may leak around the legs. This product is not meant to function as a diaper. If your child is not showing signs of potty training readiness, continuing to use a diaper is recommended. For our step-by-step guide to potty training, click here. Do you feel like your child isn't quite ready to potty train yet? We have a solution for you! Our Pull-On Diaper is designed similarly to the trainer but has the absorbency and leak protection you would expect in a diaper. Please Note: Our sizing DOES NOT correlate to disposable diaper sizing. Please check our size chart available on our website before ordering. Material Contents: Interior: 4 layers of 80% Bamboo Rayon and 20% Polyester (backside of fabric only) Waistbands, legs, & sides: 94% Polyester and 6 % Spandex Wet Zone is reinforced with laminated TPU Care Instructions: This trainer is made from natural fibers and will need to be washed and dried a minimum of three times before first use. It will increase in absorbency up to 8-10 washes. Remove any solid waste from trainer and rinse with warm water. Wash on hot with the amount of detergent recommended for your machine for a heavily soiled load. Dry on warm. Do not use bleach or fabric softener.