Your bra probably isn't the wrong size. The real problem is the tight band around your ribs doing all the lifting.

It starts small. A strap slips at your desk and you hook it back up. By lunch there's a dull ache between your shoulder blades.

By the drive home, you're counting the minutes until you can unhook the thing in the kitchen and breathe all the way out. Then you see the marks: a red line around your ribs, two dents in your shoulders.

"Women tell me this like it's a personal failing," Diane says. "It isn't your body. It's what the bra is built to do to it."

Underwire digs in under the bust and leaves the ache. So you switch to a bralette. It's soft, but there's no lift and no shape, and your top hangs flat.

The sports bra squashes everything into one shelf and traps sweat. The cami with a shelf bra looked smart, until the cups slid sideways and bunched up by noon.

Every one of them still leans on a band around your ribs to hold you up. Make it tighter and it digs. Make it looser and you sag. That's not a sizing mistake. It's the design.

Here's what Diane explains with a tape measure in her hand. A traditional bra puts most of the work on a few inches of elastic pulling across your back. That's where the digging, the back bulge and the ache come from.

Move the support into padded cups, carry it on wide straps, and let a stretch knit body hold everything close, and the band has nothing left to do.

Straps about 3 to 4 centimeters wide, roughly an inch and a half, spread the load across your shoulders instead of cutting into one spot. The knit smooths over your ribs and back instead of squeezing a line into them.

It looks like a simple scoop-neck tank. That's the point. Inside are padded cups stitched in place, and you can lift the edge to see the removable pad. There's no separate bra underneath and no strap peeking out.

The straps are wide and soft. There's no band, no hooks and no wire anywhere. The contoured stretch knit smooths your middle and back and tucks neatly into high-waisted jeans, pants or a skirt.

Pull it on over your head and you're dressed and supported in one step. Throw a cardigan over it and you're out the door. It comes in Nude, Black, White, Gray and Blush Pink, sizes S to 3XL.

Diane puts it simply: check your skin at night. In an underwire bra, you get grooves under the bust and across the back. In the tank, the wide straps leave no dents and there's no band to leave a line.

Under a fitted T-shirt or knit top, the smoothing knit means no back bulge and no bra lines. The cups stay put because they're sewn into the body of the tank, not floating on a thin shelf.

Over 134,914 women have already made the swap, and most say the same thing: they forgot they were wearing it.

You sit through a long meeting without shifting in your chair. You lift the grocery bags and nothing digs. You reach up to a high shelf and your top stays where it should.

At the end of the day there's no rush to get it off. No red marks. No sore shoulders.

You get through the whole day feeling held up, without ever feeling squeezed. That's what Diane wants for every woman who walks into her fitting room tired of fighting her underwear.

Go back to that moment in the kitchen when you unhook your bra and finally breathe out. You don't have to live for that moment.

The Buy 2 Get 1 FREE bundle is the one most women choose. It's three tanks, so you can wear one, wash one and keep one ready. Shipping is free, and you have 30 days from delivery to return it if it isn't for you.

This bundle won't stay available at this level for long. Pick your colors, pick your size and give your shoulders a break.