Sidi Asper Gravel Shoes - Mens Black 50 Millenium FitSidi Asper Gravel Shoes Mens Black 50. Enhance your gravel riding with Asper designed for every trail adventure. Velcro straps ensure quick closure and a perfect fit for a smooth pedal stroke. The new fit provides exceptional comfort and the durable scratch resistant upper withstands tough rides. With a stiffness of 5 the sole allows natural foot movement and comfortable walking on mixed terrain while offering optimal grip for pedal stability.