80% Nylon, 20% Spandex Imported buckles are hand washable only1). Versatile sexy triangle bra for girls and women - removable, adjustable and convertible straps. Can be worn as a wedding bra, t-shirt bra, low back bra, backless bra, halter bra, clear strapless bra, invisible bra or push up bra. 2). Deep V-neck and back-flattening bra for low-back dresses - Innovative adjustable single-button back straps create a low-back silhouette. Bra back straps can be pulled down to 5.5 inches lower than a regular bra. Not visible under tops or dresses. 3). Skin-friendly, seamless, comfortable bra - The side fabric of the bra is made of 77% nylon, 23% spandex, which is lightweight and sweat-absorbent. Cup lining is made of polyester; it's breathable and stretchy.