adidas takes comfort and responsiveness to a whole level in the Tennis Energy Boost. Built for the player that places the highest priority on comfort and cushioning, this premium offering features a full Boost midsole for the first time in a tennis shoe. This exciting innovation brings unmatched cushioning that won't break down over time along with exceptional energy return with every step. The upper is also built for comfort with mesh strategically placed in flex areas and a "bootie"-style construction for a seamless, secure fit. adidas is so confident this will be one of the most comfortable tennis shoes you will ever wear.