Rubber sole Style#: 907564-005 3/4-length bootie construction reduces weight and layers in the upper while wrapping the foot for a snug, sock-like fit. Synthetic overlays in the midfoot and heel add lightweight durability and support. Durable solid rubber in the heel with horizontal traction pattern for increased grip on the track. Updated eight-spike forefoot plate for aggressive traction and explosive speed with every step. Nike Zoom Rival S 9 track spikes put the focus on fast. Because extra layers mean extra weight, the Rival S 9 features a snug, 3/4-length bootie upper that wraps the foot and moves with you as you run.