Slipper Socks. Light Blue. Medium. Single Tread. PremierPro Slipper Socks offer reliable comfort and safety. Socks are made of a polyester blend with an elastic cuff for optimal comfort. Sizes are color coded. The unique tread pattern helps reduce the risk of slips and falls. Skid-resistant white PVC tread. Not made with natural rubber latex. UOM: 48PR/CS.