bumGenius One-Size Microfiber inserts are made of 3 layers of the thickest microfiber terry available anywhere. Our unique snap down design allows these stuffable inserts to fit perfectly in our bumGenius 5.0 cloth diaper. But they also work well in a small, medium or large FuzziBunz pocket diaper. Our new, wider and longer design fills up these diapers side-to-side and end-to-end. No more leaks! The One-Size Stay-Dry Insert measures 15.75 x 5.5 inches.