PowerFlow is a unique midsole compound that delivers increased shock absorption and energy return.Meta-Shank extends from the midfoot to the forefoot in a 5-finger fashion, for flexible underfoot impact protection.2 Arrow Shoc-Zone provides moderate underfoot cushioning and a 8 mm heel-to-toe drop. This is Inov-8's medium level of cushioning on their 0-4 arrow scale. The Inov-8 Roclite 325 GTX is a varied trail running shoe that delivers an optimal blend of support and protection from the elements.