SPANX, Inc. is a U.S. company which mainly manufactures footless pantyhose and other undergarments for women, particularly "body shaping" undergarments designed to give the wearer a slim and shapely appearance. The company's products are supposedly marketed to fit contemporary female lifestyles and fashion trends.
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The word girdle originally meant a belt. In modern English the term "girdle" is most commonly used for a form of women's foundation wear that replaced the corset in popularity.
Girdle vs Bra, 
