The Asics Cyber Jump features Slip Lasting-For lightweight and flexibility. Upper is wrapped and stitched before it is glued to the midsole. Double Density Pebax Spike Plate-High density plate in the forefoot of the sole into which the spikes are screwed which enhances the natural foot movement through improved flexibility. SharkDuo Outsole-Sole material which provides increased traction on various track surfaces. Lace Cover-Covered laces to prevent sand from entering the shoe. Removable Spikes-Spikes in the sole which can be removed to allow customisation of the spike configuration. Receive a free set of spare spikes when you purchase these spike shoes. Simply state on your order form what length you require.