A Calvin Klein icon. The Calvin Klein Underwear Modern Cotton Bikini is the definition of effortless. Made with super soft and supple cotton stretch for all day comfort. Designed with the original Calvin Klein logo waistband, this is a sporty look you can wear under anything. Bikini cut with full back coverage. 100% cotton gusset for breathable comfort. Soft, flexible logo waistband retains shape wear after wear and stays put, without too much compression. Style #F3787. 53% cotton, 35% modal, 12% elastane. Machine wash cold, tumble dry low.