APEX Men。The Apex Sierra Trail Runner is constructed with the most advanced technological features and represent the highest standards in performance and comfort. INCLUDES TWO apex insole inserts Diabetic Shoe Apex Foot Health has been manufacturing the most comfortable, supportive and health-conscious footwear for nearly fifty years. Designed by foot health experts, thousands of medical professionals recommend Apex day in and day out for the numerous features, healthful benefits and contemporary styles. APEX™  footwear has a minimum of 5/16” and as much as a full 1/2” of removable depth in multiple layers making customization easy and more widths to better accommodate our customers\' needs.