ASICS GEL-RESOLUTION 4 Tennis Shoes Rear and Forefoot Gel - ASICS trademark cushioning system which absorbs impact force superbly, dampening shock in the initial heelstrike and allowing for a smooth transition through the step, greatly increasing comfort and performance and reducing the risk of injury. P-Guard - Upper material features an abrasion and tear resistant synthetic material which increases upper durability and increases protection to the medial side metatarsal region. Flexion Fit - Forefoot ventilation is increased through upper adaptation, which allows the foot superb flexibility with great breathability and improved fit. Pivot Point Outsole - Encourages multi-directional movement through circular pivot points on the outsole of the shoes which give you great traction and manoeuvrability for those sharp turns on the court. I.G.S - ASICS Impact Guidance System or I.G.S is a technical shoe design philosophy that allows the athlete's foot to perform in a more natural manner. ASICS high-tech I.G.S shoes are constructed in a way that enhances your natural gait cycle.