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.