UPPER Microfiber upper is unstitched over the toes for high-level comfort. Twin reverse Velcro straps with a high-stretch gusset allow easy entry.ACTIVE RANDING The DTS (Differentiated Tension System) adapts perfectly to the dynamics of the foot in motion and concentrates power to the big toe. It works in combination with the new minimalist SRT system and the PAF heel construction resulting in a highly dynamic and elasticized overall tension. These systems keep the original shape of the shoe for the life of the shoe. SOLE 4mm 1/2 sole S72 rubber, a high-grip compound that is soft and adaptable to any surface.