Yonex Men`s Power Cushion Fusionrev 4 Tennis Shoes maintain the comfortable characteristics popular in the Fusionrev 3, but integrate a number of updates to provide a more adaptive fit. The former is true through the implementation of Power Cushion, Power Cushion+, and Toughbrid Light in the midsole, while the latter is apparent given the flexible Inner Bootie, and increasingly pronounced Flexion Upper. Overall, the Fusionrev 4 does a phenomenal job of providing competitive tennis players with a comfortable and responsive matchday shoe.