Backless Mermaid Prom Dress Sparkly Mermaid Prom Dress Backless Long Train Black Sequin Mermaid Prom Dress Lunss Mesmerizing Demeanor Black Sequin Backless Mermaid Maxi Dress Prom. This Deep V Neck Mermaid Sequins Backless Prom Dress is perfect for any special occasion. The deep V neckline and backless design add a touch of elegance and sophistication, while the mermaid silhouette and sequin detailing create a glamorous look. Stand out in style with this stunning prom dress.