Slip Lasting-For lightweight and flexibility. Upper is wrapped and stitched before it is glued to the midsole. DuoSole-Sole construction which offers lightweight flexibility and increased traction. Asymmetrical Upper Design-Upper fits around the foot to hold it securely within the shoe during turns on the track. Angled Midsole-Angled midsole to allow a smooth approach and to reach the optimal position for take off. Solyte Midsole Material-Spongy layer between the sole and upper designed to absorb shock and cushion the foot. Solyte is a lighter material than SpEVA and EVA and features enhanced durability. 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.