Caterpillar knows working hard shouldn’t mean uncomfortable, so they developed Ease – Engineered Comfort, a proprietary foam midsole that is 30% lighter, more shock absorbing and more flexible than standard EVA. The P90711 features Cat’s Ergolite Technology for lightweight performance and an EASE EVA midsole making the Tyndall one of the lightest work shoes on the market—keeping you and your feet comfortable and safe while happy and hard at work. The P90711 has built in electrostatic dissipating technology to prevent on the job static buildup, a full grain leather upper, nylon mesh lining for moisture control, dual density EVA sock liner, and a slip and oil resistant polyurethane outsole. Steel Toe. ESD Rated.