Basically, it's an adhesive tape with silicon-based spikes - called AeroBlades - that is supposed to reduce wind resistance.
According to an article by ESPN's Darren Rovell in June this year, the distance between the spikes on the tape differs depending on what part of the body you want to wear it.
Nike used a 3D printer to test various prototypes in a wind tunnel to finalise the design that would cut down on drag the best.
"We were tasked to combat the enemy of fast and deliver on the athlete's desire to look fast, feel fast and be fast," Nike's vice president and creative director for categories and concepts Martin Lotti said at the product's launch.
Athletes' attire has been focused on as much as their performances in Rio. The Egyptian women's beach volleyball pairing of Doaa Elghobashy and Nada Meawad wore leggings and long sleeves, while Elghobashy also wore a headscarf compared to the bikinis worn by their competitors.
The Dutch team also made people think twice when Marleen Van Iersel and Madelein Meppelink stepped onto the sand in bodysuits under their bikinis. Some media outlets reported they made that decision to deal with cooler weather after it had been raining in Rio.