The ASICS® Japan Thunder™ is a premium distance spike designed for the elite distance runner who races to win. Ideal for distances from 800 to 10,000 meters and the steeplechase. One-piece open mesh upper offers reduced weight a ventilated fit. Solyte™ midsole is super lightweight with super responsiveness and durability. SharkDuo® heel provides optimal traction. Wt. 5.6 oz.