"Flower Power" is written by Johan Gustafson, Fredrik Häggstam, Sebastian Lundberg (who composed labelmate TVXQ's "Blink").

It is an up-tempo electropop and dance-pop number, taking influences from trance and electro house, with a "flowing" bassline and a chorus line demonstrating the "sexy side" of Girls' Generation, contrary to the single's title.

Lyrically, the song describes "the strategic moves between a man and a woman on the dancefloor," sung by the group with "the sound and light of a glitzy atmosphere.

Within the song's perspective of the world, the nine girls sing and dance in a near future cosplay image of “bondage”-like cabin attendants under a fictional airline company, Air GG.

The same day, the group held their "Playing with Girls' Generation" fan meeting with 10,000 people at the Yoyogi National Gymnasium.