The Alphafly 3 features three innovative technologies, including a double dose of Air Zoom units and a full-length carbon fiber plate to assist with each step. The Zoom X foam midsole provides cushioning throughout the race. 2 air zoom units zoomx foam midsole full-length carbon fiber flyplate atomknit upper multidirectional containment and breathability notched laces integrated knit tongue with lofted padding fits small, recommend ordering a half size up