I can't find the video which was impregnating kevlar fibers with this kind of liquid to make them much more resistant to being stabbed with a knife. But here is one that shows the gel insert for a vest that illustrates the ability to stop a bullet. If i find the one about the kevlar and knives, which is more likely what resistweave would be like, I will post it.
http://www.sciencealert.com/liquid-a...er-than-kevlar
Here is a link to a journal article about it. One highlight from the article is that an army research study found that 4 layers of STF impregnated kevlar was as effective as 14 layer of untreated kevlar. So as far as how it moves, would not be too bad.
http://dujs.dartmouth.edu/fall-2013/liquid-body-armor