The Air Flow Snap Cover, with adjustable snaps at the waist and leg openings has an air ventilation system between the snaps. This allows for maximum air circulation as baby moves, reducing the risk of bacteria by keeping the temperature inside the diaper down. And, unlike Velcro, the curious baby can’t undo them, so they stay on until you take them off. The Air Flow cloth diaper cover is to be used with either the One Size cloth diapers or the Sandy’s cloth diapers to create a highly breathable, leak-proof cloth diapering system.