This support tank provides tummy & fatigue-relieving lower back support while reducing the waistline without compressing the chest area. From the Core fibers of 35% Dupont Lycra spandex and 24% Dupont Antron nylon wrapped with 41% pure cotton, this MagiCotton fabric stretches four ways, providing you with the best fit and compression in total comfort. The support tank features a 100% cotton chest panel for comfort. Compression begins from just under the chest through the mid-section with one layer of cotton feeling compression fabric.