- Dress up for under-sea fun with the Disney Junior Pop Tails Ariel Doll. This mermaid doll-and-accessories set, inspired by the popular Disney Junior show, Ariel, is full of stylish ways to play. Ariel, sized 7.5 inches tall, comes with 2 soft-molded mix-and-match tails, 3 double-sided fins, a peplum, and a tiara. Soft molded outfits are easy for little hands to change. To dress Ariel, remove the tail fin, which pops off with a satisfying sound. Add new fashions and pop on a reversible fin. To complete the look, add a tiara. Ariel’s molded hair features iconic hair beads that give her outfits extra sparkle.