The set includes: 3x outer diaper cover: 100% polyester PUL 3x bamboo absorbent insert: 80% bamboo, 20% cotton 3-15kg With the various buttons, the diaper size can be adjusted to fit from 3kg to 15kg. So the difference with other diapers is that they can be used for the entire period and you don't have to make 2 or 3 investments for each weight/age range. It is recommended to purchase at least extra absorbent inserts for each diaper. Since with this diaper you often don't need to wash everything, but can just change the inserts. They can also be combined with BE AWARE diapers with velvet fabric interior, which you can find on this site.