Comfortable Material: The low back bra is made of 76.9%Nylon,23.1%Spandex, smooth and seamless. Adhere to your body curve. U-shaped Back Design: Adjustable & Convertiable thin straps can convert the bra into halter style, criss cross style, clear straps. Invisible design, beautiful back, perfect for your low back tops or dresses. Altra-Low Back Bras: Single button design, high-level craftsmanship, high-quality fabric, easy to put on and take off, lightweight and comfortable. Beautiful Back With Invisible DesignAn innovative adjustable strap creates a low-back silhouette, straps can be convertable to different style making this supportive bra the perfect partner to tops and dresses that flaunt your back. Convertiable Multiway Bras:Removable, adjustable and convertible straps can be wear it as T-shirt bras, low back bras, backless bras, halter bras, clear strapless bras, invisible bras or wedding bras.