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.