75% Nylon, 25% Spex Impted Buckle closure H Wash Only 1). MULTI-WAY DEEP U SHAPED PLUNGE BACKLESS BRA-Convertible straps can be wear as low plunge bra, low back bra, backless bra, halter bra, criss-cross back bra, invisible bras, clear strapless bras, open back bra, low cut bra, wedding bras, also everyday bra. 2). BEAUTY BACK BRALETTE F LOW BACK DRESS BLOUSE- An innovative adjustable back single-button design strap creates a low-back silhouette. Bras back strap can be pulled down lower than nmal bra to 5.5 inches. 3). SKIN-FRIENDLY, SEAMLESS, COMFTABLE BRAS-The bras flank fabric is made of 75% Nylon, 25%Spex, lightweight sweat-absbing. Cup lining is made of Polyester,; its breathable elastic. 4). USE BONDING CRAFT, SMOOTH and INVISIBLE, BRAS STAY IN PLACE- Soft thin cup; 1CM Double-sided tension straps me durable; Underwire made of soft wire material, washing without defmation. Perfect fit f your body curve. 5). A CONVERTIBLE BRA F EVERY STYLE-The big U-shaped design of the back fully shows your beautiful back shoulders. Perfect partner to tops, low-cut backless dresses that flaunt your sexy charming back. The backless bras are a wardrobe staple that make wearing all kinds of fashion possible. These innovative bras can be wn with practically any outfit, thanks to their versatile construction.