Convergence GEL Technology Provides Two Points Of Engineered Support By Replicating The Fatty Tissue Of Your Foot. Combine That With The New Engineered Mesh Upper For Increased Breathability And Support, The GT-1000 5 Shoe Has The Performance And Stability Of Its Predecessor With The Latest In Stability Technology, And Did We Mention It s 0.5 Ounces Lighter This Year.