These have the 2.1 sole, they have now 3.0 which is barefoot emulation. They have them as NikeID as well, I am really considering customizing a pair but I have to train on lightweight running more, I just got a new pair two days ago and made a short spin with them. They felt good, in a few kilometers, I will get used to running in such shoes and I'll consider Free 3.0 more seriously.