A support arranged for disposition within a shoe, boot or sandal, to raise the arch of the foot by everting the forefoot and inverting the rearfoot, thereby locking the midtarsal joint. The support basically comprises a base portion and a wedge portion. The base portion has an upper surface on which the wedge portion is disposed. The wedge portion includes a medial side edge and a lateral side edge and extends from the base of all five metatarsals of the person's foot to the heads of all five metatarsals. The wedge portion tapers in thickness from at least the midline of the wedge portion to the medial side edge. The wedge portion includes an anterior portion that is tapered to the sulcus section of the wearer's foot.