Strapless Blue Mermaid Long Dress with Slit PollyBoutique Strapless Blue Mermaid Long Dress with Slit PollyBoutique Blue Long V neck Open Back Lace Mermaid Prom Dress with slit BIZTUNNEL Navy Blue Open Back Mermaid Short Prom Dresses, Mermaid Navy Blue Home. Crafted from satin, this blue mermaid gown features a corset bodice with double straps and an open back design. It includes a zip closure at the back, a built in bra for support, and extends to floor length, creating an elegant silhouette. SKU:?? NP2640 Satin material Blue color Mermaid silhouette Corset bodice with double straps Open back Zip up back Floor length Built in bra