Upper: Recycled Polyester, Synthetic Suede. Midsole: Helion. Outsole: Rubber. Speedboard: Nylon 6. Lace-Up Fastening. Longer Laces For Unique Styling. Extended Lacing Area. Open Mesh Tongue. Fork Speedboard® For Flexibility. Cloudtec® For Soft Feeling Underfoot. Heel Clip In Speedboard® For Improved Support. 7Mm Heel-To-Toe Drop. Created In Partnership With Fka Twigs.