Mermaid tail sets come in child sizes M - XL and in teen/adult sizes from JS to JL. Buy them together and save. These make a great gift for the mermaid in your life.
Note: toddler tails are not made for monofins.
Seven Seas Mermaid Tail + Monofin Set
On Sale from $79.95
Rainbow Sparkle Mermaid Tail + Monofin Set
On Sale from $69.95