This research investigated the degradation of three nonwoven fabrics (fiberwebs) containing polypropylene and/or cotton. Physical and morphological properties, indicative of degradation, were compared for samples subjected to three different treatment conditions up to sixteen weeks in duration. The three treatments were: outdoor composting in a tumbler; heat and moisture in an oven; and, to provide control fabrics, a standard textile-testing environment. Changes in tensile strength and percent elongation were evaluated, in addition to fabric-surface discoloration and physical damage visible by light microscopy.