NIKE Flex 2014 Run (TDV) #643245-007 NIKE FLEX 2014 RUN (TDV)#643245-007 UPPER: Stretched inner sleeve with breathable overlay saddle gives the best fit and breathability. MIDSOLE: Phylon midsole provides flexible lightweight cushioning. OUTSOLE: Articulated Phylite carrier midsole provides flexible lightweight cushioning with great durability. Flexible, lightweight comfort are the best way to describe this ride.