Mermaid tails for children ages 2 to 5, fits like a skirt Beautiful and realistic mermaid scale designs Comfortable swimsuit fabric with 4-way stretch (80% Polyester, 20% Spandex) Fun for dress up, costume play, or supervised use in water Matching bikini swimsuits can be purchased separately Size XS fits kids ages 2 to 3. Size S fits kids ages 4 to 5. See size chart in product photos. Our realistic scale mermaid fabric is 80% polyester and 20% elastane (spandex) material with 4-way stretch. The fabric is extremely comfortable and breathable. Fun for dress up, costume play, or supervised use in water. Designed for younger children who aren’t yet strong swimmers, the toddler tails are shorter, and fit more like a skirt. These toddler tails do not work with a monofin.