Heavy duty version is recommended for high impact sports

Soft and smooth coverage that can be worn on its own or as an extra layer

IMEVA (injection-moulded EVA foam) midsole for firm yet flexible cushioning

Supportive flat-knit upper

Unisex Nike Zoom Rival Distance US Men's Size (Women's):4.0 (5.5) Heavy duty version is recommendedWith a lightweight, breathable upper and cushioned midsole, this adaptable spike dials you in for a wide range of middle and long distance races. It takes learnings from the game changing Dragonfly spike to give you efficient energy return for the tough middle laps and top end speed as you kick into the homestretch. Cushion for the Push Added cushioning at the midfoot and heel give you the comfort needed for longer distances and a smooth, propulsive