The OBB Marathon™ pocket diaper is built with an inner layer of revolutionary athletic wicking fabric™ to gently pull moisture away from baby's skin. As thin as a layer of silk, it won't pill up like microfleece and breathes so much better than suedecloth. The outer layer of buttery soft waterproof PUL keeps clothes dry with no need for a waterproof cover. The two layers open on the end to form a pocket -- like a pillowcase -- to stuff your absorbent bamboo insert, which comes free with the purchase of every Marathon diaper. The strip of loop fabric on the front panel is soft against baby, conforms to her body shape, and is plenty wide, allowing you to adjust the rise on the diaper for a totally custom fit. The gentle stretch on the wings from the lightweight fabrics allows for a comfortable, snug fit. For more information about the OBB Marathon Pocket, please visit our website.