Runs small - size up 1/2 size BEST FOR: High-performance fitness walking + Light running PERFORMANCE TECH: Full-length RE-ZORB responsive cushioning for shock absorption + RE-ZORB crash pad at the heel for extra support where you need it most MADE FOR WOMEN FIT: Designed for a woman’s unique foot shape, muscle movement, and build with a narrower heel, roomier toe, and softer foot cushioning MATERIALS: Breathable mesh with reflective overlays + Padded collar for extra cushioning