Curvy Kate Happy Boobs Balcony Bra (CK0551). The Curvy Kate Happy Boobs Balcony Bra CK0551 has semi-opaque geometric lace cups with supportive underwire. Silvertone, Oeko-Tex approved metal smile charm is sewn into top center. Wide straps are soft elastic and fully adjustable. Curvy Kate's Happy Boobs Balcony Bra is made of recycled polyamide/elastane.