Surprise fabrics, Fabrics include, cotton lycra or 100% cotton toppers, bamboo toweling and flannel for cores. Bamboo toweling is soft, anti-bac and also very abosorbant, backing is polar fleece or PUL  on the heavier pads which will be hidden to help with keeping pads secure, kam snap fastening.
Materials have been prewashed but it is advised pads are washed 3-4times before using. 
Rinshed used pads can be washed with your normal washing if fabric softner is not used.