Soft, synthetic leather upper is lightweight & locks your foot in for explosive takeoffs. Smooth, ultrasonic welded seaming with Bemis tape for next-to-skin support & comfort. Seamless heel cup with silicone grip for a locked-in, anatomical fit. Laser-etched perforations in the tongue & upper provide maximum ventilation & breathability. External TPU heel counter for locked-in support. Full length Pebax plate is ultra-strong, ultra-lightweight for explosive starts. 8-pin track spike construction is built to keep you on your toes for high-end speed. Weight: 5.9 oz.