SKU:9156456Whether you're pushing yourself to complete a 5k, half, or full marathon, Nike is committed to delivering your best on the pavement. Stay determined mile after mile with the Nike Free RN 2017!Leave the rest behind with the light and responsive Flex RN 2017!Predecessor: Free RNPredecessor: Flex 2016 RN.Support Type: Neutral.Support Type: Neutral to underpronation (supination).Cushioning: Lightweight, flexible response.Surface: Road. Surface: Road.Differential: Not provided.Differential: 8 mm.Lightweight, breathable knit mesh uppers with thin, fused synthetic overlays. Circular-knit upper and lightweight synthetic overlays provide a great fit and feel. Flushed color throughout upper for added design.Dynamic Fit technology utilizes Flywire cables built into the lacing to promote an adaptive and supportive fit. Flywire cables are built into the lace-up closure for adjustable, adaptable fit.Lace-up closure. Lightly padded tongue and collar for a supportive wear.Lightly padded tongue and collar. Soft fabric lining offers a great wear inside shoe.Breathable fabric lining offers a great in-shoe feel. Removable foam insole. Minimal, molded textile footbed. Fused synthetic throughout forefoot.Phylon midsole features two levels of cushioning to promote a smoother ride.Plush foam in midsole delivers exceptional cushioning and lightweight durability. Rounded heel mimics the foot's shape and rolls naturally with the ground. Auxetic tri-star outsole pattern supplies lightweight, flexible cushioning. Outsole boasts hexagonal flex grooves that helps absorb shock while allowing the foot to move naturally in every direction.Rounded heel encourages a natural heel strike. Lightweight, solid rubber under the toe and heel deliver reliable traction and lasting wear for longer miles.Rubber segments under the toe and heel deliver lasting traction and wear. Weight of footwear is based on a single item, not a pair.