Nike ReactX Infinity Run 4 Road Running Shoes Gray Orange FJ 1222-005 Size 7.5 NWOT. With supportive cushioning built for a smooth run, the Nike Infinity RN 4 is a brand-new take on a familiar favorite. It's made from all-new Nike ReactX foam, which gives you 13% more energy return compared with Nike React foam, providing extra cushioning and comfort. Rare gray color with vibrant orange accents. New without tag/box. More features:*Updated Flyknit upper and a water-resistant membrane help keep you dry*New ReactX foam in the midsole for extra cushioning*Waffle outsole for durable traction on the roads*Ultra-comfortable collar and tongue for a soft, snug fit