This bamboo insert is designed to fit inside the Littlelamb Sized pocket nappy but works just as well in our OneSize or any other brand of similar nappies.It's made from 100% Oeko-tex yarn and is woven rather than knitted to keep the bulk down. They are three times as heavy as our standard bamboo booster and absorb three times the quantity of fluid.As there are no seams they dry quickly - quicker than a similar cotton insert.Being woven, and not knitted, they will shrink up to 10% in size after the first few washes but that doesn't affect the efficiency.