The Sentry and Sentry Pro collections now feature the GLADIATOR™ outsole tread pattern which is a thick, chevron-shaped lug channel design with wider channels to expel larger debris. It's built for oily, greasy and wet environments and best for indoor or outdoor industrial environments where there are larger, more solid pieces of debris like pebbles and rocks. With a shaft height of 14.5 inches, the Sentry Pro features a unique blend of PVC and nitrile rubber for enhanced durability and shaft flexibility. Its waterproof protection is augmented by a "drop-in" comfort insole that acts much like a midsole, providing extra cushioning right beneath the heel. Meets ASTM F2413-18 (I75/C75, Electrical Hazard Protection-EH).