The Nike LunarStelos Men's Running Shoe features deep outsole flex grooves and dual-density cushioning for a natural ride and lasting comfort. Perforations on both sides give you excellent airflow during your run. Mesh upper enhances ventilation Dual-density midsole delivers plush comfort Hot-knife cuts in the midsole/outsole for flexibility No-sew overlays and heel molding for structure and support Perforations on each side of the midfoot enhance ventilation Outsole rubber at the heel and toe provides durability.