Abstract: A footwear insole includes an insole body extending along a longitudinal direction between opposite end regions. An elongated recessed arch cavity is formed in the insole body at an arch region between the end regions. The recessed arch cavity has a bottom opening at a lower surface of the insole body. One of a plurality of arch inserts of different hardnesses is selected, and is inserted through the bottom opening and mounted in the recessed arch cavity for supporting a wearer's arch during wear. The selected arch insert is adjustably positioned at a selected one of a plurality of positions spaced apart along the longitudinal direction for adjustably supporting the wearer's arch.