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The Bootie Butler shoe cover is constructed from a durable spunbond polypropylene base-layer and coated with a heavy-duty layer of chlorinated polyethylene (CPE), making it waterproof and extra-durable. The blue CPE coating extends nearly to the top of the bootie, providing enhanced durability and waterproof protection. These shoe covers feature an extra-deep design to accommodate larger shoes and work boots, and include a strong elastic band for a secure fit. Approved for Class 100 and Class 5 cleanroom use per Federal Standard 209E and ISO Standard 14644-1 Class 5. Perfect for aerospace, clean rooms, construction, data centers, electronics manufacturing, healthcare, and pharmaceutical settings.