ASICS GEL-CHALLENGER 9 Tennis Shoes Rear and Forefoot Gel - ASICS trademark cushioning system in the heel as well as the forefoot, 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, reducing the risk of toe injuries. Rhyno Skin - High abrasion resistant synthetic leather is attached to the upper to avoid excessive wear. 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. AHAR+ - A thinner and lighter version of ASICS High Abrasion Rubber. It is placed on heavy contact areas of the outsole to reduce excessive wear.