The song is the first track on his debut solo album Smash Your Head Against the Wall and ends with the main riff from one of Entwistle's popular compositions, "Boris the Spider".

When Entwistle was asked about the song, he said simply: "'My Size,' was just written in the studio, we wrote the chord progressions and then I went home and composed the tune and the words.

"[1] In another interview Entwistle called "My Size" a sequel to his 1966 hit with The Who, "Boris the Spider".

Entwistle later said: "A lot of people thought that 'My Size' from 'Smash Your Head' was actually the new Who single.

"[2] The 'My Size' versions on the Sundazed and Repertoire re-releases are completely different.