K-SWISS Women's Keahou II NP Running Shoe 100% Synthetic and mesh Rubber sole Lightweight and breathable synthetic mesh upper for comfort and ventilation, with synthetic overlays for support and durability GuideGlide midsole construction offers a smoother heel-to-toe transition, superior cushioning, and stability Breathability is enhanced by a Flow Cool moisture management system located from heel to toe to keep feet cool and dry Springier, long lasting cushioning and comfort is also provided by SuperFoam? technology in the heel crash pad Y-BEAM Mid-foot support structure anchors the arch area of the foot