Bali One Smooth U Bounce Control Wirefree Foam Bra (DF3458). The Bali One Smooth U Bounce Control Wirefree Foam Bra DF3458 has padded t-shirt cups with tall smoothing and supportive sides with anchored adjustable straps. Bali's One Smooth U Bounce Control Wirefree Foam Bra is made of nylon/spandex.