Designed for slim, tighter fitting footwear, the Superfeet Black Footbed supports flat, extra sensitive feet to align and control the motion of your feet, providing balance, support and shock absorption. They feature Agion® antimicrobial top cover treatment to reduce bacteria and help prevent foot odor. The Superfeet Black Insoles are ulta-thin, and work well in most lower-volume casual and sport (running, mountain biking, or tennis) shoes, or when you can't remove the inner sole from shoes. This insole is also ideal for flatter feet and is only insole available with a rear-foot control point that helps control over-pronation, giving you less stress on your muscles and joints. This stabilization continues at the mid-foot for enhanced control and less muscle fatigue.