Based on 120,000 3D footscans and extensive biomechanical research, the insole features an optimized PU foam shape for exceptional comfort and a great fit for most wearers Anti-fatigue and tetrapod technology minimize pressure points by dispersing compression Arch support for enhanced stability and comfort Compression-set and energy-rebound foam keep you comfortable all day long Dual-density foam crafted for optimal comfort optimization Podiatrist-designed dynamic heel cup with shape retention foam