ORTHOTIC SHOE INSOLES: Designed by a doctor, the MEGAComfort MultiThotic uses a patented high-density dual layer 100% memory foam with two attachable orthotic arch supports to provide adaptive comfort and shock absorption. INTERCHANGEABLE ARCH SUPPORT: The light green flexible arch-support is recommended for medium/regular arch support and the dark green rigid arch support is recommended for low arch/pronation support. MEDICAL-GRADE CONSTRUCTION: Made from medical-grade polyplastic, MultiThotic is a cost-effective initial replacement for custom-made orthotics. MICROBIAL REDUCTION PROPERTIES: The top cloth features Silver Ion Anti-Microbial Technology to prevent the growth of bacteria and fungi. They also feature anti-perspiration and anti-odor technologies. EASY TO CARE FOR: Machine washable, MultiThotic work shoe and boot inserts are extremely easy to care for. They're an ideal option for stationary, mobile and outdoor workers.