Impact Guidance System (2000):

The Impact Guidance System is a design philosophy that aims to improve the natural gait of the foot. It consists of various design elements, such as a Guidance Line and a Guidance Trusstic System, which work together to guide the foot through a more efficient stride. This improves the overall performance of the shoe, reducing fatigue and increasing speed and endurance. 

The Impact Guidance System is a design philosophy that aims to improve the natural gait of the foot. The IGS consists of various design elements, such as a Guidance Line and a Guidance Trusstic System, which work together to guide the foot through a more efficient stride. This improves the overall performance of the shoe, reducing fatigue and increasing speed and endurance.