Preflats are cloth diapers that feel so soft and cozy!   Made with two layers of super stretchy, buttery Bamboo.  When folded, the diaper has six layers of absorbency.  The Good Vibes One-Size Preflat is trim and absorbent.  Pre-flats are the internal, absorbent layer of a cloth diaper, so they need a cover to be waterproof.  250GSM Bamboo.