Response cushioning model of the Trigon offers a standard durometer EVA midsole. Carbon rubber is used in the entire heel and toe-off area of forefoot (black) for durability. The forefoot impact area uses soft responsive blown rubber (blue) for cushioning. Saucony's patented Grid technology provides heel cushioning and stability. HRC (High Rebound Compound) provides responsive forefoot cushioning Weight 12.6 oz