From product description: Flexible support and shock absorbing cushioning from heel to toe help reduce fatigue, prevent common running injuries such as shin splints, and boost performance everywhere you run, from the trails to the track; the insoles also fold at the flex point, enabling maximum flexibility with movement 3D Dynamic Arch Technology & Multiprofile Arch Support: Medium arch support profile with deep decoupled heel cup that fits, wraps and locks the heel in place, improving stability, reducing pressure, and providing a perfect fit Engineered to Energize Your Running: Rebound cushioning and controlled power transmission provide faster regeneration and powerful propulsion with every stride; plus, a zero heel drop provides a great fit in most running shoes with optimized motion for all running foot strikes (insoles can also be trimmed to fit for the perfect fit) Moisture Management & Breathability: Top layer mesh and PORON premium foam design help dehumidify the inside of shoe, keeping the feet dry and running shoes fresh throughout exercise; note you should replace your CURREX insoles after 500+ miles or 12 months, whichever comes first