The Nike Free 3.0 V4 Anthracite Silver Wolf Gray Mens Running Shoes have so many benefits that there are so many loyal fans. Seamless upper construction to reduce weight and irritation, while maintaining structural support. Asymmetrical lacing to even pressure distribution over the top of the foot. Sipes along the length and width of the midsole to enhance flexibility. Molded sockliner to provide comfort. Carbon rubber in outer heel enhances durability. Solid rubber on the medial toe to increase durability and traction in the Nike Free Run Shoes.