Regular fit ULTRAWEAVE upper Stack height: 40mm and 32mm? Weight: 265g Heel to toe drop: 8mm? Fast R Nitro Elite 2 Is Puma's Ultimate Race Day Footwear With Enhanced Nitrofoam Elite And Pwrplate Technologies. Enjoy A More Propulsive Ride And Optimized Running Economy With Increased Stack Heights And An Aggressive Shape. The Ultraweave Upper Ensures A Lightweight And Secure Fit, While Pwrtape Support Keeps You Firmly In Control As You Conquer Your Race Course. From Short Distances To Marathons, This Shoe Offers Unbeatable Speed And Cushioning For Your Best Performance Yet.