Nike Zoom Rival M 8 Unisex Distance Spike Women,Men, Vast Grey, Size. dominate the middle distances the nike zoom rival m 8 unisex distance spike offers a lightweight feel and locked-in support with single-layer mesh and flywire cables. a pebax ® plate provides stability with minimal bulk and seven removable spikes offer custom traction for multiple distances, hurdles and jumping events. benefits single-layer mesh enhances ventilation phylon foam in the heel provides responsive cushioning pebax ® plate for firm propulsion seven removable spikes for traction flywire technology locks down the midfoot spike plate extends further back to act as a midfoot shank for stability phylon midsole for lightweight cushioning and support product details solid rubber through the heel with a pyramid-shaped traction pattern for enhanced grip and durability no-sew overlays add support in the midfoot synthetic underlays provide an internal structure for support weight: 177g approx. (men’s size 9 women’s size 9) spike length: 7mm pyramid spikes.