At least this article is under Sport rather than Science section of the Daily Mail: it claims the special shirts ionise the skin allowing for increased blood flow and thereby increase performance in football players wearing these shirts. There’s of course no clear evidence for this..
This is how it’s supposed to be working:
It reminds me of a swimsuit that was modelled on shark skin to reduce friction. Swimmers really believed it gave them an edge over other swimmers, yet the speeds at which they were swimming were nothing like those of sharks and hence rendered their swimsuit useless apart from hiding their private bits…
Science journalist, news editor at Research Professional News
Mićo Tatalović is a news editor at Research Professional News. He has previously worked as a science news editor at Nature, New Scientist, and SciDev.Net. In 2018, he completed the Knight Science Journalism Program at the Massachusetts Institute of Technology in Cambridge, US, where he researched the use of machine learning and artificial intelligence in science journalism. He is also immediate former chairman of the Association of British Science Writers, and a board member of the European Federation for Science Journalism.
He runs the section Balkan Science Beat.
He runs the section Balkan Science Beat.
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EuroScientist journal 
I remember blood flow is regulated by the vascular which can contract or expand in its diameter with its smooth muscle.
The graphics is nice though.