Key changes to the 17th edition of the Wave Rider series include a reduction in weight to 220 grams. Cushioning and stability from preceding versions is retained and expanded upon, through a redesigned upper which sees several overlays removed to offer greater freedom in the forefoot. Finer mesh detailing works with the honeycombing of Mizuno"s Intercool technology to deliver even more breathability with an internal structure that conforms to your running stride, in turn improving both fit and comfort. SR Touch replaces VS-1 as a lighter, softer heel cushioning compound, yielding improved impact resistance upon heelstrike. The Mizuno U4iC Wave midsole has been designed to be unlike comparable shoe technologies. When the foot touches the ground, Wave attenuates and redirects impact forces away from the foot. Acting much like a car"s suspension, it cushions and keeps the foot centred in the shoe throughout the stride. Through the use of differing wave shapes and designs, Mizuno are ultimately equipping each model to fit the unique stride of the individual runner; if its a local jog or running past the 20 mile marker, Wave will always feel amazing underfoot. Research carried out by Mizuno has indicated that there is a significant difference between the biomechanics of the male and female running gait. Tests revealed that the angle, velocity and speed of pronation is higher in women than in men. Research has also found that the transition from foot strike to toe off is slower in men than in women and that the angle at which the heel contacts the ground is more severe in women than in men. As such, Mizuno products employ specific male/female designs that accommodate these differences.