Nike Free RN Flyknit, size 11, when you want a barefoot-like feel, super light and flexible. Its sock-like upper has more stretch yarns so it hugs your feet more than ever. The innovative sole has an updated construction, yet still expands and contracts with every movement. The packable design makes the shoe easy to stuff into your bag—so you can get in a few miles on the fly. Grey, black, white. Worn very little, excellent condition, owned by an older gentleman who never ran in them and walked very little.