POLYESTER ROUND SLINGS A Round Sling is an endless loop of yarns, covered by a woven tubular jacket. Super Slings round slings are manufactured by using high tenacity polyester yarn's and extra durable covers. Color coded, conforming to international and WSTDA standard which validate sling capacity. Our specialized "HEAVY DUTY TWILL JACKET" performs better than plain double jackets. It provides 30% better abrasion resistance compared to conventional 2 plied polyester jacket in the Field. Heavy Clear Plastic Covered Rating Tag Extends the life of the sling and also includes WSTDA guidelines.