I'm not *positive* it actually improves my posture, but it makes me think about my posture, which in turn makes me stand up straighter. It's also just a solid, supportive sports bra (I'm a runner) ...
The wire-free design means that it’s comfortable enough to wear all day without any unwanted digging in. While it’s of course not as supportive as a regular bra, as someone with a larger cup ...