The Z-Fit Insole is engineered with replaceable arches. The low, medium and high arches can be interchanged to properly support your feet. The arches attach with a hook and loop system and can be interchanged easily. The patented Z-Fit custom arch insole is the fastest way to happier and healthier feet. By custom adjusting the Z-Fit to your arches, you will feel less pain and more comfort in minutes. Z-Fit ships with two insoles, two low arches, two medium arches, and two high arches (8 parts). The Z-Fit arch is easily customizable to your particular arch type (low, medium or high). Simply detach and replace with the appropriate size. Arches vary in height from person to person and left foot to right foot. Often the left foot is different than the right foot. By adjusting the proper Z-Fit arch to your left and right foot, your arches will be properly supported, and you will experience better balance, alignment, and support for your whole body, not just your feet. In addition to the custom arches, the Z-Fit is breathable, has extra padding, and is lightweight. The Z-Fit will be one the healthiest investments you will make in your feet and body. By properly supporting your arches, you reduce the risk of long-term foot pain while maximizing comfort. The Z-Fit Custom Arch Insole provides comfort and relief on every step of your journey. Customize your ride today with Z-Fit.