The A-Wave Orthotic Shoe Insert is designed to provide an added layer of support, stability, balance and comfort to your shoes that is customized to your arch height. With three levels of support – Flex for high arches, Firm for medium arches and XFirm for low arches – you can use the A-Wave to quickly and effortlessly transform almost any pair of shoes into customized, comfortable and supportive pair of shoes. Utilizing a proprietary blend of thermoplastic resins, along with performance memory foam and supportive gels, the A-Wave works by supporting the arches so that the foot can do its job in the most biomechanically efficient and pain-free way possible as you move about.