- from our sports illustrated x forever 21 collection, this knit bikini top features underwire, high - polish "si" hardware, adjustable cami straps, and a self - tie back. . Sports illustrated is a trademark of abg - si llc. ©abg - si llc. Sportsillustrated. Com. Shell: 82% polyester, 18% spandex. Other contents: 92% polyester, 8% spandex. Hand wash cold. Model is 5'9" and wearing a small. Women's sports illustrated bikini top in fiesta medium