Every brand of diaper has its own sizing – and the manufacturers usually provide waist and hip measurements to guide the user in selecting the best size and fit. All incontinence garments should be form fitting and close to the body as gaps in the leg holes or gaps at the waist can cause leaks. And just as in garments, no two product fit alike so we encourage sampling to ensure a great fit. In fact, we estimate most diapers leaks due to poor fit more than due to a lack of absorbency. Diapers should fit snugly but still feel comfortable.