This soft ribbed knit fabric is a rayon blend with cosmetic-grade vitamin E incorporated into the fibers. The seamless circular knit construction ensures a comfortable feel against the skin. Because it's knitted on a circular knitting machine, it's highly elastic, stretchy, and offers a stress-free fit. It includes built-in bra cups, allowing you to wear it directly against your skin. The subtly curved front neckline creates a healthy, skin-baring look. The round straps don't look like underwear even if they peek out, making it easy to wear with trendy sheer tops.