361 Spire 4 Women's Ebony/Glass Add a spring to every step with the 361 Spire 4! These running shoes are perfect for neutral runners looking for a high-performance trainer to push them forward faster. Enjoy stepping into a breathable knit upper with a padded tongue for plush comfort. Savor every stride on the QU!KFOAM™ midsole with excellent responsiveness, cushioning, and durability. If you're a runner searching for a solid daily trainer, then the 361 Spire 4 is worth your consideration! Upper: Breathable knit upper promotes ventilation to prevent your feet from overheating during exercise. MORPHIT construction in the midfoot and heel comfortably hug the foot into place for a glove-like fit. Ortholite insole uses 20% recycled materials while retaining the feel that runners want. Midsole: QU!K FOAM midsole comprised of EVA rubber blend with PU coating maintains high energy return and long-lasting comfort throughout the life of the shoe. QU!K SPRING+ EVA adds lightweight responsiveness. QU!K SPINE midfoot shank provides the perfect blend of stability and support. Outsole: QU!K FLEX 4FOOT engineering provides a more natural and balanced toe-off. Increased ground contact is designed for improved traction and acceleration.