I used diaper flannel in the ones that I made for my grandson, you can order it online from Joanns. The other options they recommend besides the gauze is microfiber which is similar to towelling and I also used the terry cloth towelling also available through Joanns for the centers of the pads. There are lots of tutorials and recommendations on line for cloth diapers. Joanns also sells the waterproof material for the outside of the diaper covers.