Dual wave technology. 3/4-inch length fits easily in shoes and won't crowd toes. Helps reduce muscle fatigue in feet & legs. Try it risk free. Money back guaranteed. See back for details. No trimming required. Helps reduce muscle fatigue in feet & legs and allows you to stay on your feet longer. All day energizing support and cushioning. With dual wave technology. Outrageous comfort. Gel waves help reduce heel impact. Contoured support. Flexible arch provides added support. For use in everyday shoes.