Hey guys, I got myself one of these binders a few weeks ago, I only have the medium underworks tritop to compare it to though.
So I ordered a medium sports pullover even though I measured a little over the medium sizing guide but I thought why not. The front material is a layer of binding material surrounded by stretchy material and the back is meshy, but a different mesh to the tritop.
I put this binder over my head and it was much easier than the tritop, when it was on I can honestly felt like I was wearing basically nothing! I mean I could tell I wasn't naked :p but I could actually inhale properly in it! So I went to the gym in it and did my usual weightlifting workout and it felt awesome! I could even do a bit of cardio! (I couldn't when I wore my tritop)
This binder is shorter than the tritop and doesn't make you completely flat but for me it is passable flat easily still!
I recommend this binder definitely to anyone who fancies it and is a small c cup or smaller! Wouldn't really be able to tell for larger sizes so....