Adidas adiZero Prime SP - The adidas adiZero Prime SP track spike features a SPRINTWEB seamless upper that is designed using a laminate composite to lock the foot down during the event-specific motion of high-level acceleration while maintaining a barefoot feel. Laser-welded Spaceframe in the midfoot provides maximum support using geometry. Reduces bending through two independent pieces welded together to create a plate that is stiffer than the actual materials used to construct it. adiZero Nano plate transfers power through the whole foot while reducing torque on the midfoot to maximize energy return. Plate minimizes weight while giving the maximum energy output elite sprinters seek. Six permanent nano-ceramic compression pins are positioned to minimize braking forces and support greater propulsive impulse for accrued speed. Integrating the pins into the shoe allows the foot to be closer to the track. Recommended for 60m, 100m, 200m, 4x100m and 110 hurdles. Removable insole. Wt. 3.8 oz.