Kyte BABY knotted caps are made from silky smooth bamboo rayon allowing them to fit comfortably on your baby's head while being the right amount of tight. They also coordinate well with all of our layette and sleep bags so you can mix and match. Babies are constantly growing, so our incredibly stretchy material is excellent for creating knotted caps as the stretch is able to fit a wide range of head circumferences comfortably. The cooling and softness of our bamboo rayon fabric is also perfect for your newborn baby's delicate skin.