Women’s size US 8. But fits like 7.5. It was a gift but size didn’t fit. I’d recommend getting it if your size is 7.5 US. For 8 it was too tight for my feet and I have narrow feet. Mizuno Wave Sky 9—a high-performing workhorse made for the ones always aiming to reach the finish line in record time. Featuring MIZUNO ENERZY foam, these eco-friendly shoes offer versatility while maintaining softness and resilience for an exceptional running experience. These sneakers feature Foam Wave, consisting of two layers of foam—a top layer made with U4icX for lightweight cushioning and a bottom layer crafted from MIZUNO ENERZY for energy return. Chase your goals, one mile at a time, with the Mizuno Wave Sky 9. Mizuno Wave Sky 9 features: Smooth stretch woven upper adapts to the foot and keeps the foot position correct. Gusseted tongue with stretchy tongue lining hugs the foot securely and comfortably. MIZUNO ENERZY NXT midsole maximizes cushioning. X10 carbon rubber outsole adds durability. Weight: 8.6 oz.