Textile Women's Specific Upper Fit - For added flexibility, including a bunion zone. Foamed Air Mesh Upper - For light weight, optimized breathability, and a personalized fit. Reflected Welded Overlays - For added support and visibility. neutralCELL Designation - For optimal cushioning and flexibility that provide an efficient, smooth ride for the neutral runner. Lace Close with EverFit Technology - Secures the foot without inhibiting its natural movement.