On 15 April 2016, a remix featuring Jamaican rapper and singer Sean Paul was released by Syco Music as the fourth and final single from the album.

Following its release as an instant "grat track" in promotion of Get Weird, "Hair" debuted at number 35 on the UK Singles Chart on the week ending 10 September 2015.

The video revolves around a sleepover the group are having while confronting Paul in a FaceTime call after Leigh-Anne Pinnock had seen a picture of him with a woman on their Instagram feed.

[8] On 23 June they performed an a-cappella version of the song at C’Cauet sur NRJ in Belgium and Jade Thirlwall sang the uncensored chorus for the first time.

[12] The group also performed the song at Free Radio Live in Birmingham on 26 November and Capital FM's Jingle Bell Ball on 3 December 2016 at The O2 Arena.