Abstract: A multi-layer filter fabric includes a first layer that includes a first non-woven fabric and a second layer that includes a second non-woven fabric. Each layer may include multiple webs. The first and second layers have different median pores sizes and porosities, with the first layer having a larger median pore size and/or porosity than the second layer. The first and second layers may be separated by a scrim. The first and second layers are colored or have visible markings such that the first and second layers are readily distinguished from each other. The multi-layer filter fabric is arranged so that a fluid may enter the multi-layer filter fabric through the first layer and exit through the second layer.

Abstract: A mattress encasement and method protect against the migration of bed bugs into and out of a mattress. The mattress is encased within encasement members constructed of a material resistant to the migration of bed bugs through the material. The encasement members are joined together along perimetric edges by the engagement of a zipper provided with a peripheral length greater than a perimetric length of each perimetric edge. With the zipper engaged fully along its peripheral length, the difference between the peripheral length of the zipper and the perimetric lengths overlaps an inner segment of the zipper adjacent one terminal end of the zipper with an outer segment of the zipper adjacent the other terminal end of the zipper, to complete a barrier against the migration of bed bugs into and out of the encased mattress through either one of the terminal ends of the zipper.