The inside is lined with a layer of incredibly soft and absorbent micro terry fabric much like the padded potty training pants. (pottyscotty.com)
We also have wool, fleece, bamboo, hemp, micro-fleece, micro terry polyester, and a number of other options that go far beyond the old - fashioned plastic pull - ups that are lightweight and inexpensive, but did not breathe to allow ventilation and did not last long before drying out, or were a mess when you pulled them off. (believemidwiferyservices.com)
The outer layer of our diapers is micro terry which is significantly more absorbent than cotton. (wonderwear.ca)