Snap in training undies. These undies were designed for my son in 2011. Each undies has a snap in training pad. Each pad is topped with cotton to not mask the wet sensation. Inner is super quick absorbing microfiber to catch accidents. Backed with pul to protect clothing. The snap in design stops wicking to clothing as no stitching in the undies. If it is just a little accident simply unsnap pad and place in another one. Also with the pants being in two parts it quickens drying time!! Comes with one extra pad.