Long-lasting support packed into a thinner, high-performance insole to help improve the fit of a wide range of footwear. Superfeet insoles keep their shape, delivering reliable support and comfort for up to 12 months or 500 miles, whichever comes first. The medium-profile shape puts support right where you need it, but takes up less space in the shoe. Closed-cell foam supports and cushions the foot for long lasting comfort. All natural coating that eliminates odor-causing bacteria. The rails reinforce the narrow cap to provide structure and support. The structured heel cup helps stabilize and support the foot and positions the heel to naturally absorb impact.