They see a perfectly fitted soft to the skin 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 tummy and pressing against your back in support. Wear it to workout, as your power undershirt, alone or on that special date. The Compression is a secret between you and your garment. A chest binder breakthrough. Beware of overseas imitations. Or the Spanx copies. Made in the USA since 1999.