They see a perfectly fitted soft to the skin regular Cotton Spandex knit tank top that stretches and recoils as your body moves but on the inside are powerful layers of nylon spandex knit binding your chest, flattening your belly and pressing against your back in support that they do not see! Wear it as an undershirt or by itself anywhere and everywhere and only you know the magic the shirt is providing you. Compression and compression fabric are not detectable. Made with pride in the U.S.A.