The adidas adiZero Prime Accelerator track spike is designed for the 100 to 400 meters. Welded, stitchless composite membrane upper with suede inner frame and Sprint Web overlay. Sprint frame supports the foot and transfers the power through the superlight chassis to the track. TPU plate provides lightweight performance and durability. Replaceable spikes. Non-removable insole. Comes with 1/4" pyramid spikes and a wrench. Wt. 5.4 oz.