DURABLE CONSTRUCTION. Superfeet insoles keep their shape, delivering reliable support and comfort for up to 12 months or 500 miles, whichever comes first. SUPERFEET SHAPE. The medium-profile shape puts support right where you need it, but takes up less space in the shoe. YOUR PURCHASE MAKES A DIFFERENCE. Every year, 1% of Superfeet sales and 1,000+ volunteer hours go to support organizations working to shape strong foundations for a healthy future.. HIGH-DENSITY FOAM. Closed-cell foam supports and cushions the foot for long lasting comfort.. ORGANIC, ODOR-CONTROL COATING. All natural coating that eliminates odor-causing bacteria. STABILIZER CAP. The rails reinforce the narrow cap to provide structure and support. HEEL CUP. The structured heel cup helps stabilize and support the foot and positions the heel to naturally absorb impact