The new Adidas Adizero Prime Finesse worn by Jessica Ennis will help you find your true speed with a new six-spike configuration that maximises acceleration & decreases deceleration. Lightweight asymmetrical Sprintweb upper construction, for the technical sprinter who thrives on speed. Specifications: Shoe Category Track Spikes Ideal Use Track Running Weight 130g (size 8.5) Glossary: SPRINTWEB Upper Engineered for more powerful sprinters provides the same support as preceding model with 30% less weight 6 Pin Configuration Reduces braking forces & promotes acceleration Full length Guidance line Guidance line running from heel to big toe which promotes a better foot-strike Compression Pin Improves energy return & increases acceleration