Product Description It is developed to effectively absorb shocks and help reduce excessive pressure of running or sports. with a strong arch support and cushioning it is carefully designed to fit athletic footwear. Gelavtic Technology Strong arch support for active feet Impact cushioning for heels, knees and ankles Sole shape design for all day comfort How to use Trim to fit if neccessary. Cut along the outline that matches your shoe size or use the origional insole as a guide.