I am starting with the shallow reason because it is the honest one.

The first morning I put it on, I turned sideways in the mirror and saw one smooth line from ribs to hips. No shelf where the band sits. No pulling my shirt away before a photo.

I have spent four times this on shapewear that squeezed me like a tube of toothpaste and did less.

Here is the physics no bra company explains. A bra forces the whole weight of your chest onto three narrow points, two straps and one band. The heavier your chest, the deeper those points dig.

The support runs through the whole garment instead of hanging off two straps and one tight band, so no single point carries the load and nothing digs in anywhere.

I am a 38DD and this was the first thing I checked. It holds. No bounce on a walk, no spillage, nothing pressing into my ribs by lunchtime.

Three o'clock used to be when I started counting down. The straps were digging in. The band was tight. I was already thinking about getting home and taking my bra off.

With this tank, three o'clock comes and goes. No hooks. No underwire. No band tightening after lunch. Twice now I have gone to bed in it because I forgot I was wearing it.

I did not realize how much of my day I spent waiting to be comfortable.

Here is something I learned from my mother's assisted living community: most of the women there quietly stop wearing bras. Not because they want to. Because reaching behind your back to work a clasp is a small piece of coordination that leaves quietly at some point, and asking someone else to do it feels far too intimate.

This one pulls on over your head. That is the whole procedure. No clasp, no hooks, no reaching.

My mother is 83. She dresses herself again, every morning, and she told me on the phone that she feels put together for the first time in two years. I sat in the car afterward and cried. That is the real reason I wrote this article.