Save $3.58 – Eco-Conscious Ballerina Slippers. Faux Sherpa Lining. Memory Foam Insole. Slip-Grip Outsole.ÃÂ Recycled Polyester Fibers Are Made Of Post-Consumer Plastic. Upper And Lining: 100% Recycled Polyester…. Was: $17.90. Price: $14.32 (Price correct on 2021-11-04)