3/4 Metatarsal Arch Support Orthotic Device Insert Insole: The base of this orthotic is made of a flexible, rigid, and light-weight polypropylene. It is strong to provide foot support and stability, and has a spring action that flexes with each step to support the metatarsal and arch. This orthotic provides comfort while standing, walking or running. It conforms to the shape of your foot for support, aligning your body to relieve pain associated with plantar fasciitis, heel spurs, tired feet, and aching feet. This orthotic is designed in a 3/4 length and thin thickness to relieve pressure on the forefoot and suitable for a wide range of shoes.