f using a prefold or flat cloth diaper, Snappis make sure the diaper stays in place and doesn't bunch up under the cover.
Snappis are made for regular flat or prefolded diapers that need to be held closed. Since Snappi fasteners work by gripping onto the fabric of diapers with little teeth, it will not work with fabrics that cannot be gripped like microfiber or thin gauzy weaves. Snappi fasteners work best with thick woven cotton fabrics. Washable cloth diapers made of microfiber or hemp cloth may not work as well with Snappis since they do not have a weave for the fasteners to grip onto.