The bamboo and cotton boosters are compatible with the Magabi pocket and fitted pocket, but can also be used in sio/ai2 covers (because they have internal flaps that keep them in place) and therefore go directly into contact with the skin, but also inside in the fitted night and aio side to increase absorbency. they can be washed at 60° and can be tumble dried. they are available in 4 sizes: S 5-7kg 30x10cm 4 layers M 7-10 kg 35x10,5cm 4 layers L >10kg 37x11cm 4 layers long: 3 layers 70x10,5cm about the old version was made of 70% bamboo viscose , 28% organic cotton and 2% polyester (the latest version from 60% bamboo and 40% organic cotton)