Predecessor: Flex Experience RN 6. Cushioning: Light, flexible response. Lightweight mesh upper with no-sew synthetic overlays is designed for a streamlined, sock-like fit. Lace-up closure. Low-cut profile. Lightly padded tongue and collar. Breathable fabric lining. Foam insole. Injected foam midsole doubles as an outsole, supplying lightweight comfort. Hexagonal flex grooves promote a more natural underfoot feel.