Synthetic leather in the upper provides support and durability. Nike Fastflex outsole promotes articulation. Webbing on both medial and lateral sides engages with the laces to lock you in. Pull tabs at the heel and tongue makes it easy to put on and take off. Molded details add durability and abrasion resistance. Foam midsole. GAME-READY TRACTION. The Nike Force Savage Shark 2 is built for the trenches. Its durable design is backed by molded details made to help resist abrasion. A Nike Fastflex outsole keeps things going with an articulated design that helps you move freely.