ASTM F2413-18 rated composite toe. Quick on/off YKK® side zipper. Ground-gripping TacTRACTION rubber outsole. E03120/E03164 Built to last with durable full grain leather. E03121 Built to last with durable suede leather. High abrasion anti-fray polyester mesh is durable and breathable. Actively pulls moisture away from foot with moisture wicking lining. Built to last with toe and heel outsole stitch. Form fitting and breathable removable PU insert. Energy returning lightweight CMEVA midsole. Made with a modified last for better foot position. Better ground connection with 11mm heel to toe drop. Athletic strobel construction. Full movement flexibility with outsole flex channels. Outsole exceeds industry standards for slip resistant and oil resistant. E03520 - Built to fit her foot with a specifically designed women?s last.