The Kanga Care Prefold Diaper is a thirsty 4x8x4 thickness of layers in an organic cotton and viscose of bamboo blend fabric that comes in four different sizes to meet the individual needs of the different sizes of infants and toddlers. They are serged with brightly colored thread that designates the 4 different sizes. Our prefolds are made to work with our one size and newborn Rumparooz Diaper Covers.