Nike Free RN Flyknit 2018 Men's Running Shoes (Black/White) Expired

how are these different from the Nike Free RN 2018?

Got a link? I can't find them.

So what is the promo code? or was it one time use?

Also, are the soles on these more rubber or foam like?

These are flyknit

I got a pair for $66 after tax using a student promo code.

How do these compare to epic reacts?

If they had the Oreo's at that price I'd buy a pair.

I wore freerun non and flyknits for past 4 years or so and just bought Epic React flyknits to try. I put my shoes through about 10 hours of walking at work every day, installing flooring. Epic React is a narrower shoe, I had to size up half a size. Makes your feet look a bit bigger. It's narrower and longer. Huge difference between two is the sole, epic react is not all sliced up into bits like free runs and that was major reason I'm trying them out now. Often times we're working on new production homes with no concrete yet, just gravel and running in and out of the house to make board cuts you tend to pick up a ton of little gravel rocks. Then if you don't periodically clean them out, you can scratch the new floor up as you walk. Epic react has a solid shoe sole and also it's a bit thicker too. I didn't think I was gonna find a softer shoe than Free Runs, but these Epic Reacts are ridiculously soft, even with uncut bottom, whith a huge chunk of foam right under your heel.
When it comes to upper, Free Run flyknit is better IMO. It's more like a sock which is what I'm looking for when working on my feet for 10 hours a day. Epic React's upper is really close, but area starting at around ankle and going behind heel is made of a much harder and stiffer material. Possibly this is better support for running, at the cost of comfort, and on my case it's a negative since I don't actually use them for running. I only had Epic Reacts for a few days, so it's possible that they just need to break in for a bit to get as comfortable. Free Runs don't need any break in though. So upper goes to Free Runs with more sock like feel.

TLDR:
So, my personal tally but keep in mind I use these for work and home but don't actually run:
Bottom: Epic React - Softer and doesn't collect rocks, yet toes still bend easily like Free Runs.
Top Flyknit: Free Runs - More of a sock all around and very easy to put on without laces
Fit: Free Runs - Epic React runs narrow, have to size up half a size, makes shoe bigger and heavier than it has to be and it's still a bit tight on sides. Could be a good thing for runners for support though, dunno.
Overal Comfort and my pick so far: Free Runs by a hair. The upper being a bit more comfortable and matching my foot width better just makes it a bit more comfortable shoe for me currently, but I have a feeling Epic Reacts will break in over time and get more comfortable. My ideal shoe would be freeruns flyknits with epic react sole.

EDIT: Forgot to say this: Free Runs closely feel like you're wearing nothing at all. They're like a more compact version of epic react, very nimble and light, yet very comfortable. And while Epic React is a very comfortable shoe, and possibly more comfortable than free runs for people with narrow feet, there's no mistaking it, you got shoes on your feet. Bottom sole in some spots is probably double the thickness of free runs.

No worries about nails installing flooring? These are not stiff shoes and these shoes don't provide much support if you step on something hard or on something like a nail. It would go right through.
That said I've had 3 pairs of these type over the last 6 years. I love them all. Most comfortable shoe I've ever worn. But don't do anything where you need protection on your feet with these like hike, construction, ladder work, etc...

What is the sole made of ？Soft soles？

Soft soles. Lightest shoes I've ever held