The L.O.L. Surprise! Mermaids Baby Sisters feature a color-changing tail that transforms when dipped in cold water. Each doll comes with mermaid-themed accessories for interactive play. The reusable packaging functions as both a carrying case and a clamshell display. This series includes 8 collectible Baby Sisters dolls, which can be paired with the Mermaids Tots and Tweens collections for expanded play options. The Mermaids Tots line allows customization with interchangeable mermaid tails, while the Tweens collection introduces 4 new fashion dolls with color-changing tails. Accessories are designed for mixing and matching across the L.O.L. Tot BFFs lineup.