Interestingly, a good pair of noise canceling in ear headphones. I have ADHD, and being able to block out the world to focus on what I need to do is a godsend.
It depends on if you’re on Android or Apple. The Bose Earbuds 2 and the Apple Airpods Pro 2 trade blows pretty well, both in noise canceling and sound quality. I personally prefer the sound stage of the Apple ones but if actually care about stuff like that, I pull out my cans.