The Little Dreamer night nappy has a stretchy terry outer and skinny cotton fleece inner. They are the sizes of flats folded origami. Small - similar to Newborn Medium - similar to Petite Large - Similar to Osfm There is a fold for boys and girls and it can also just be folded like the inside of an origami flat. The heavy wetter option comes with a long booster backed with waterproof softshell. Important to note that they have a LOT of stretch, so no need to buy bigger Little Dreamers have the same convenience as the popular perfect prefolds for ease of use and flexibility. One of the most gentle options for little leggies especially for long nights. Snapless nappies are to be used with a snappi. Covers are needed for fully absorbant nappies.