Snap In One (Sio) Made with one layer of silky and stretchy printed fabric, hidden waterproofing and awj inner. With Natural cotton snake insert and booster. They are roomy and accommodate a wide range of sizes. Added snaps inside makes them convenient to attach inserts. They can also be used over flats/inserts/prefolds. They are meant for daytime use as they won't necessarily fit over all night solutions. PLEASE NOTE Always dry covers in shade for longevity and to to ensure color doesn't get affected by the sun.