Which insulation type is made from fabric?

Cotton batts are the correct answer as they are indeed made from fabric, specifically from processed cotton fibers. This type of insulation is often chosen for its eco-friendliness and ability to provide sound absorption, as well as its non-toxic characteristics, making it a popular choice among those looking for sustainable building materials.

In contrast, fiberglass batts are composed of glass fibers, which are known for their excellent thermal insulating properties but are not made from fabric. Mineral wool batts, made from naturally occurring minerals or industrial byproducts, such as basalt or slag, also do not qualify as fabric insulation. Plastic batts, while not commonly referenced in insulation discussions, typically involve synthetic materials that would not fit the fabric category either. Thus, cotton batts stand out as the only insulation type here that is derived from a fabric source.