HEAD Nitro Pro tennis shoes are built to help you generate high rebound in the forefoot for the best and fastest acceleration possible. A harder EVA frame around the heel and midfoot ensure a rigid and stable experience. You'll benefit from the enhanced comfort of the HEAD Cooling System™ built into the sockliner. Upper: One-piece breathable vamp and tongue mesh offer breathable flexibility. Anti-stretch TPU skin provides additional lateral support. 180° Drift Defense features rubber toe cap and medial protection. Built with breathable and lightweight EVA tongue construction. Features a TPU heel collar for stability. Lightweight TPU skin welded on breathable mesh. 360° integrated lace frame provides better individual fit adjustment.Midsole: TRI-NRG technology provides exceptional cushion and energy transfer.Lightweight EVA sockliner with midfoot HEAD Cooling System™. Neutralize shock-absorbing heel EVA. 3D TPU shake provides torsional stiffness.dOutsole: Built with lateral stability trigger TPU enhanced. HEAD Hybrasion+™ rubber compound provides enhanced durability. Non-marking outsole.