Experience the comfort of a training shoe and the performance of a spike, all in one lightweight package. Breathable mesh upper features FlexFilm™ overlays for lightweight support. SSL EVA in the midsole for lightweight, responsive cushioning. XT-600 carbon rubber outsole with a four-spike Pebax plate for durable traction over any terrain. Comes with 3/8" pyramid spikes and a wrench. Wt. 5.3 oz.