Design: Very flexible leather upper VTS system has been incorporated where extra ventilation is needed, allowing air to enter and exit In the ankle and tongue, foam has been introduced for greater comfort, lightness and fit The tongue adapts to the shape of your foot for a perfect snug-fit, a feature that is optimized with the PERFECT FIT lacing An extra piece of rubber in the toecap to protect the area and improve the precision and power of the strike In-Shoe Comfort: FULL DUAL PULSOR double phylon midsole of different densities with REACTIVE BALL Traction & Durability: The outsole is made of high-quality rubber with good abrasion resistance, griping the indoor court perfectly