Saucony - Endorphin Spike (White/Silver/Red) - Women's: The lightest, most breathable materials available in a cross country shoe. Spike last using a Strobel technique. Compression molded EVA midsole. XT-Lite in the heel. Molded Peebax spike plate. 3M reflective for night visibility. One piece Air Mesh upper. XT-600 carbon rubber outsole for durability. Shoe weighs 5.5 ounces.