The panties are made of a soft and comfortable black cotton with a just enough spandex for just the right amount of stretch. The front is detailed with a small logo below the waist and the thong is a T-back design. These are great to wear under workout tights, leggings, jeans or dresses. Many women tell us that the are their favorite underwear to wear under athletic leggings because they do not show panty lines and he wide waistband keeps them in place perfectly. Cotton 92% Spandex 8% Machine Wash.