One Size Plus in the SIO version will be an ideal solution if: - You are just starting using cloth diapers and your baby is aready around 10kg. - You are looking for perfect wool cover to use with our PUPPI fitteds in One Size. SIO covers have 2 additional snaps placed inside of the cover to snap in the SIO inserts. The cover is sold separately, without inserts. For One Size Plus cover we recommend to choose SIO inserts "size L" and use them together with "size S", which will boost the absorbency. The wool cover is sewn from 100% fine merino wool - the finest sheep's wool that is ideal for baby products. Wool cover is an outer part of a cloth diaper which is supposed to keep the moisture of absorbent insert inside the diaper. Care Instructions: Hand washing using wool shampoo. Ventilate after each use. Detailed information about washing you will find in the leaflet joined to your cover.