Bontrager inForm BioDynamic insoles with Superfeet are engineered to harmonize the interface between body, shoe, and bike, giving you the complete foot support you need to ensure mile after mile of pain-free pedaling. Models are color-coded: Red is low; Yellow is mid; Blue is High. - Engineered for unparalleled foot control, pedaling efficiency, and comfort - 3D Arch Pillar provides optimal arch support for improved knee alignment - Precision molded heel cup helps stabilize and align the foot - Footrest metatarsal pad helps reduce or eliminate hot foot - inForm BioDynamics—Optimizes natural movement for sustained, higher performance