Alpha Pro Tech, Ltd. is engaged in developing, manufacturing and marketing a line of disposable protective apparel and infection-control products for the cleanroom, industrial, pharmaceutical, medical and dental markets through its wholly owned subsidiary, Alpha Pro Tech, Inc. It also manufactures a line of building supply construction weatherization products through its wholly owned subsidiary, Alpha ProTech Engineered Products, Inc. Its products are sold under the Alpha Pro Tech brand and private labels. Its products are grouped into two business segments: the Building Supply segment, consisting of construction weatherization products, such as housewrap, housewrap accessories, synthetic roof underlayment and synthetic roof underlayment accessories, as well as other woven materials; and the Disposable Protective Apparel segment, consisting of disposable protective garments (including shoecovers, bouffant caps, coveralls, gowns, frocks and lab coats), face masks and face shields.