Mizuno Women's Wave Inspire 21 Size:7.5 the aerodynamic design improves air 195394586329 the aerodynamic design improves air circulation for better breathability and body temperature regulation This wooden handled brush has tough bristles which means it’ll remove any dried on dirt (no matter how tough) and all without impairing performance Hit the ground running in the Wave Inspire 21 which has been designed for comfort and performance The top midsole is composed of MIZUNO ENERZY and the bottom midsole is made from MIZUNO ENERZY NXT and this combination results in comfortable heel landings and smooth weight transfers while running