Get the support without interrupting your stride. Introducing Brooks GuideRails®, a holistic support system that keeps your body aligned during your runs. Acting like bumpers on a bowling alley, GuideRails® work to gently steer your stride when form begins to fade. It keeps excess motion in check to prevent unnecessary impact on your knees, back and hips. With GuideRails® in your shoes, you can stride smoothly and safely to your destination!