The upper is constructed from a microfiber which is superbly lightweight, durable, and abrasion-resistant. Strategically positioned perforations for enhanced ventilation and comfort. 3D ankle protection for improved fit and a lighter weight. Original speed lace system derived from auto racing shoes. Strategically positioned metallic mesh vent for improved airflow. Extremely lightweight, specifically compounded rubber sole provides textured grip, excellent absorption, and features an integrated support shank for enhanced sole rigidity. Replaceable anatomical EVA footbed, with Lycra lining on top. CE-certified.