The Brooks Addiction GTS 15 lets you spend more time on your feet. For runners and walkers who need cushioned support, the new and improved Addiction GTS 15 now uses Brooks' GuideRails holistic support system. Similar to bumper rails in a bowling alley, this GuideRail system sits on both sides of your heel and midfoot to align your body with its natural motion path and reduce excess joint movement. A stable base, soft cushion and smooth ride helps with balance and lets you easily transition from walking to running when you feel like going fast. Comfortable for all-day wear or long walks and runs, the Addiction GTS 15 uses a well-built 3D printed mesh upper with plenty of stretch and structure to avoid rubbing or blisters. The roomy fit and forefoot construction is spacious enough to accommodate orthotics and insoles as well, making it a great option for flat or high-volume feet. Now even lighter than previous models, the Brooks Addiction GTS 15 has the stability and cushion you need to maintain your daily mileage and exercise.