“40 Below” is the seventh track on Mick Jenkins' Wave[s]. The title goes in conjunction with the theme of the song; “40 Below” is a reference to 40 degrees below zero, a very cold temperature; in the song, Mick talks about a woman that has grown very cold meaning she has become stingy and maybe heartless.

The song contains a sample of the Fred Myrow & and Malcolm Seagrave composed Phantasm OST intro and main theme song.