The microfiber inserts (or soaker pads) are made from 4 layers of 100% unbleached microfiber. The material is made up of many tiny strands, environmentally friendly and gives 40 times more absorbent surface than cotton. These inserts are soft, super absorbent and very easy to clean and dry. They are reusable and can be machine wash and dry in any temperature. Suitable for heavy-duty use.