This is the new Fluminense FC 17/18 third football shirt by Under Armour.
The new third kit is inspired by the burgundy colour of the club crest and will be worn during the Campeonato Brasileiro Série A and 2018 Campeonato Carioca.
They'll probably only wear it once against another team when there is no kit clash, and yet wear their away kit against the likes of Atlético-MG and actually cause a clash. Only in Brazil eh!