Apex Running and Walking footwear are constructed with the most advanced technological features and represent the highest standards in performance and comfort. Innovative bungee closure Synthetic upper Mesh accents for breathability Rubber outsole for traction and stability Also comes with real laces 5/16” removable depth in 2 layers Qualifies for A5500 ABOUT THE A LAST A Last styles are recommended for those who have bunions, arthritis, diabetic feet, or who need shock removable insoles, high/wide toe box, adjustability, X-wide widths.