Heights vary across the category, typically from about 7 inches up to around 16 inches tall.
Mermaid dolls are typically made from plastics and polyester; some listings also report nylon or fabric components.
Common accessories include combs or brushes, hair clips or beads, small tiaras or jewelry, and sometimes small sea-animal figures or vanity surprise accessories.
Most listings show red hair; one listing shows blonde. Other hair colors are not clearly specified in the available details.
Some dolls are articulated (examples include articulated neck, shoulders, hips, or head/arms), while other listings state “No Articulation.”
Features include water-activated light shows or fountain-like skirt effects, realistic swimming motion for some dolls, and at least one listing notes a tail that changes color when immersed in cool water.