An underwear shaper is an undergarment that helps create a smooth silhouette and sculpt your figure to highlight your natural curves, especially when wearing tight-fitting clothing. This type of foundation garment is often called ‘Spanx’, after one of the most popular brands available on the market, though countless fashion and lingerie labels sell them. Because of its compressive nature, shapewear has a reputation for being uncomfortable but, thankfully, things have improved in recent years thanks to advances in fabric technology. One thing that hasn’t changed is the role of such undergarments—they’re designed to help your clothes fit better and boost your confidence, whether you wear them every day or on special occasions.