Flats are the style of absorbent inner most like old-school terry toweling nappies. These flat squares of fabric are folded into the perfect nappy in a variety of ways and secured with a Snappi. They are the fastest drying Co Cotton boosters nsider doubling up on boosters for the OSFM stage if you don't already have some smaller flats with which to boost your nap and night nappies! (From Squiggles and Squash website)
