The upper is constructed from a microfiber which is superbly lightweight, durable and abrasion resistant 3D ankle protection for improved fit and lighter weight Original speed lace system derived from auto racing shoes for a personalized fit and feel Ankle hook & loop strap provides secure closure and fits flush within upper ankle polymer protection panel to ensure streamlined finish External�TPR (Thermoplastic Rubber)�toe reinforcement helps protect against abrasion Flex areas on heel and instep for an enhanced comfort while walking Advanced 3D mesh offers a highly breathable lining together with a microfiber suede anti-slip surface inside the heel Internal protective toe box and heel counter are positioned under the microfiber outer chassis Extremely lightweight, specifically compound, rubber sole provides textured grip, excellent absorption and features an integrated support shank for an enhanced sole rigidity Replaceable anatomical EVA (Ethylene Vinyl Acetate) footbed with Lycra lining on top Strategically positioned metallic mesh vent for improved airflow Cat 2 C.E. Certified to 89/686/ECC EU directive