75% Nylon, 25% Spandex Imported Buckle closure Hand Wash Only 1). Multi-way deep U-shaped plunge backless bra – Convertible straps can be worn as a low plunge bra, low back bra, backless bra, halter bra, criss-cross back bra, invisible bra, clear strapless bra, open back bra, low cut bra, wedding bra, or everyday bra. 2). Beauty back bralette for low back dress or blouse – An innovative adjustable back single-button design strap creates a low-back silhouette. The bra back strap can be pulled down lower than a normal bra to 5.5 inches. 3). Skin-friendly, seamless, comfortable bras – The bra fabric is made of 75% Nylon and 25% Spandex, lightweight and sweat-absorbing. The cup lining is made of 100% Polyester; breathable and elastic. 4). Use bonding craft, smooth & invisible, bra stays in place – Soft thin cup; 1CM double-sided tension straps are more durable; Underwire made of soft wire material, retains shape after washing. Perfect fit for your body curve. 5). A convertible bra for every style – The big U-shaped design of the back fully shows your beautiful back and shoulders. Perfect partner to tops, low-cut and backless dresses that highlight your elegant back. Backless bras are a wardrobe essential that make wearing all kinds of fashion possible. These innovative bras can be worn with practically any outfit thanks to their versatile construction.