Self: 53% spandex 47% nylonContrast: 77% nylon 23% spandex. Stretch fit. Innovative seat construction lifts and separates for the perfect shape. SPAN-WI46. 2318. Smooth, slim, shape, and lift with SPANX, the ultimate wardrobe problem solver from Sara Blakely. With a full range of body-shaping innovations, SPANX provides the perfect undergarments for a blemish-free silhouette.