The SIESTA insole helps prevent and relieve splayfoot. This insole features a sturdy support for the longitudinal arch and a built-in orthopedic inserts/pellet for the latitudinal arch, to maintain and regain their anatomically correct position. SIESTA insole has a purifying active carbon filter to help prevent foot odor and an anti-bacterial treatment to help prevent the growth of bacteria and fungi. Women's sizes: 5 thru 12. Men's sizes: 7 thru 13.