The Superfeet Blue Trim 2 Fit Insoles feature control points in the rear and mid-foot for increased stability and comfort, plus a top cover specifically designed to reduce friction and heat inside the shoe in adverse weather conditions.Rearfoot control point - Ensures less stress on muscles and jointsMidfoot control point - Increases stability to give you more enduranceSupport bridge - Provides balance and alignmentTop cover - Specifically designed to reduce friction and heat inside the shoeLong-wearing closed cell foam construction - Provides natural shock absorption