SureGrip® Shoe Cover, non-skid, thread colors for convenient size identification, serged seams, Gaylord packaging, 4,500 pair/case. - These general purpose, top value shoe covers work great on a wide range of floor surfaces. The ultra low particle count SureGrip material is extremely clean and exhibits excellent durability and anti-skid properties - without adding any extra material to the sole that could add to contamination concerns. Multiple style options add to the versatility of this product: serged seams for added traction and snug fit; serged elastic sole for dry or moist environments; sonic welded seam for absolute particulate and biological containment; conductive shoe covers for environments where ESD is a concern. The Gaylord packaging option which ships and stores 30 cases standard, can save you money in labor, time and waste management fees.