Pearl iZUMi Women's W EM TRI N 2 v2-W Running Shoe 100% Textile and Synthetic Imported Synthetic sole Seamless upper provides support and structure in a lightweight, seam-free package Dynamic offset-shaped emotion midsole is biomechanically tuned for a neutral to supinator running gait Sock-like upper construction and integrated quick lacing system promote lightning fast transitions, heel stack height 23 millimeter includes midsole and outsole 11 energy foam in forefoot cushions upon impact and returns energy back to the runner during propulsion, 11 energy foam in heel cushions upon initial ground impact Blown rubber in the forefoot and carbon rubber in the crash pad combine for premium cushioning and abrasion resistance, dynamic offset 4 millimeter at initial contact to 7.5 millimeter at mid-stance