[3] In a post to social media on July 30, Danielle Haim revealed that the track started as a GarageBand demo on her phone.

The lyrics were inspired by producer and Danielle's then-partner Ariel Rechtshaid's cancer diagnosis during the making of their second album, Something to Tell You; Danielle said that during the band's time off from touring, she wanted to be Rechtshaid's "hope when he was feeling hopeless" and a "light that shined on him when he was feeling very dark", which led to her singing "I'm your summer girl" over the demo's bass line.

[1] Pitchfork named the song the Best New Track, with staff writer Michelle Kim describing it as having a "jazzier palette than Haim's usual guitar-forward funk-pop", calling it "sweetly plaintive" and saying that with the lines "You walk beside me, not behind me/Feel my unconditional love", "Danielle positions herself as a rock for her partner and invokes the age-old belief: Love has the power to heal.

[6] After performing the track live, the group shared a snippet of the song being played in the studio on social media.

The video presents a slightly longer mix of the song, running at a total time of 3 minutes and 52 seconds.