For global Korean pop star HEYOON, her custom in-ear monitors are more than just a piece of gear — they're essential to her performance. "You wanna give the best performance to the audience," she says, "so it's actually blocking out the noise of the world so you can really tap into your performance and be on your best game." Molded specifically to fit her ears, the monitors stay in place through quick changes and intense choreography.

HEYOON first got her in-ears in 2018 while preparing for a world tour with her former group Now United. "It felt like the beginning of it all," she recalls. Now, as a solo artist, these in-ears remain her grounding force. "I have so many memories with these — and I can't wait to make more." For more episodes of It Goes To 11, visit GRAMMY.com/videos.