New Balance UMD500B7 Mid Distance Track Spikes Sz. 6 Unisex sizing Black and white This runner features a new six-spike configuration to help provide an aggressive but forgiving ride. 6 spike configuration Breathable air mesh Innovative REVlite midsole provides premium responsiveness and durability at a 30% lighter weight than other foams with comparable performance Removable spikes for superior traction Synthetic/mesh upper Unisex sizing. These shoes are reported to run a bit small. Please consider ordering a half size up. MD500 Racing In good pre-owned condition. Gently used. From a smoke free pet free home. Always speedy shipping.