Calvin Klein D3428 Invisibles Thong Speakeasy L This silky thong panty has very flat waist and leg openings for an invisible look under clothes. Sides are seamless. Made of nylon/spandex with a cotton crotch lining. Laser-finish waist, leg openings and seamless sides lie flat under clothes. Mid-rise styling covers more of your tummy. Thong panties provide minimal rear coverage. Tagless to prevent skin irritation and chafing. This thong style replaces style F2636.