High-quality, breathable synthetic fiber. Classic 3-strap closure * Injected internal shank provides good pedaling stiffness, with flex where you need it. * Injected rubber with aggressive lugs for traction in dirt and mud. * Accomadates SPD clipless pedals, flat pedals or toe-clips/straps * Molded EVA footbed with medium arch support. Aegis� anti-microbial treatment