PolyLite Sleeve Covers are ideal for use in nonhazardous environments such as hospitals, clinics, laboratories, food-processing facilities and painting applications. Disposable polypropylene covers are made of cool, comfortable and lightweight polypropylene. Elastic at the ends secures the covers onto your sleeves for better protection.PolyLite Sleeve Covers are ideal for use in nonhazardous environments such as hospitals, clinics, laboratories, food-processing facilities and painting applications. Disposable polypropylene covers are made of cool, comfortable and lightweight polypropylene. Elastic at the ends secures the covers onto your sleeves for better protection.