Shoe of choice for touring pros David Ferrer and Nicolas Almagro, the Raptor Ultra IV Speed takes the Lotto Raptor line to new levels of comfort and performance. This update features a slightly concave-shaped outsole called ReactiveArch that moves in unison with the foot as it strikes the ground. This results in maximum cushioning, increased stability and more energy return on impact with the ground. The shoe also possesses the Syn-Pulse cushioning system in the midsole that acts as a spring, giving you an explosive first step on aggressive movements. The outsole is made of a special durable rubber compound and is backed by a 6 month outsole durability guarantee. It also comes with two sets of laces so that you can find the look that works best for you. This comfortable and stable shoe is a great choice for elite players and weekend warriors alike.