Choosing a safe mermaid tail for a child

A child's first mermaid tail is often a present, chosen from a photo on a shopping site. A little knowledge before you click makes a big difference. This guide explains the types, what to look for, the warnings regulators have issued, and how to check a tail once it arrives.

We do not sell tails, so this is honest advice rather than a sales pitch. In lessons, tails, fins and masks are lent, so a child does not need their own to learn.

First, decide what the tail is for

Not every "mermaid tail" is made for swimming. Before comparing designs, be clear which kind you are looking at.

Type	What it is	Water?
Dress-up or blanket tail	A costume or a snuggly blanket shaped like a tail	Never. It is not made to swim in
Fabric swim tail with a monofin	A stretch fabric skin over a separate plastic fin	Pool only, with an adult watching
Monofin on its own	A single fin holding both feet, no skin	Pool only, with an adult watching
Ordinary fins	A pair of fins, one on each foot	Legs stay free; still needs supervision
Neoprene or silicone tail	Heavier tails, often made to order	For trained, experienced swimmers, not young children

That first row matters. A tail made for dressing up is the wrong thing to take to the pool, however pretty it looks wet. That is our own practice, and it is simple common sense.

Tails, monofins and ordinary fins

How each one changes swimming

Royal Life Saving Society Australia (RLSSA) draws a clear line. A tail encloses the body from the waist down and holds the legs together. A monofin holds only the feet. A tail affects balance and the ability to support yourself; both make it harder for a child to keep themselves safe.

Royal Life Saving WA tested children aged 2 to 12, in research funded by Australia's consumer regulator. Their swimming skills dropped sharply in both tails and mermaid fins. In its published results, the fins set children back even more than the tails. Children tired faster, struggled to float and stand, and lost confidence.

Which to choose

Ordinary fins leave the legs free. RLSSA suggests them as an alternative, and advises avoiding tails that bind the legs together.
A monofin keeps the legs free above the feet. Royal Life Saving WA does not recommend mermaid fins for children under 10, partly because they often slip off.
A full tail binds the legs. Royal Life Saving WA suggests tails only from age seven, or at a set swimming stage.

For a young child who mostly wants to play mermaid, ordinary fins and a mermaid swimsuit may give the fun with far less risk.

Age labels

Children's tails usually carry a recommended age of six and over, according to Australia's consumer regulator. One children's tail maker, Fin Fun, goes further. It advises no tail with a monofin for children aged 5 and under, or under 20 kg.

An age label is a minimum. It says nothing about whether your child can swim well enough. Read Is my child ready for a mermaid tail? before you buy.

Some makers say their products meet toy safety standards. That tells you about the product as a toy. It does not tell you your child can swim safely in it.

Sizing and fit

A tail that does not fit is harder to swim in and harder to get out of.

Measure, then use the maker's chart. Measure waist, hips and foot length, and check against that maker's own sizes.
Fit for now, not for growth. Fin Fun stresses the correct size of monofin. A fin that is too big lets feet slip about; a skin that is too long bunches around the knees.
Snug foot pockets, not tight ones. Feet should stay in while kicking, but come out when your child wants them to.
No back fastenings your child cannot reach.
The skin must slide off easily, even when wet.
Check the fit every few months. Children grow, and last year's tail may now pinch.

Our guide to tails and monofins explains fit and materials in more detail.

The removal test

The most important feature of any tail is that your child can get out of it alone. RLSSA asks that a swimmer can free their feet from the fin without help, and reach the side, a ladder or shallow water. It also advises checking that the tail or fin can be removed easily.

Try this before the first real swim:

On dry land, let your child put the tail on and take it off. Note anything fiddly.
In standing depth, with you in the water beside them, ask them to free their feet and slide the skin off.
Follow the maker's own removal steps. Practise until it is quick and calm.
Repeat at the end of a swim, when they are a little tired. That is when it matters most.
Never in deep water first. If they cannot do it in the shallows, they are not ready for deep water.

If your child cannot pass this test, the tail stays in its bag. Some tails, especially silicone ones with a sealed-in fin, may never pass it for a child.

Buying online

Most children's tails are bought online, often from overseas sellers. Regulators have taken action against some of them.

The UK's Office for Product Safety and Standards rated a children's tail with a built-in monofin as a high risk of drowning in 2022. Warnings were missing from both the listing and the product. The listing was removed and the product withdrawn.
A product safety notice published by a London council describes a similar children's tail swimsuit. It did not meet UK product safety rules, and the listing was removed.
Australia's consumer regulator warned parents to choose carefully, especially at Christmas, and to consider a lesson on how to use a tail.

Before you buy, look for:

Clear safety warnings on the listing and the product.
An age and weight recommendation.
A sizing chart with measurements, not just "S, M, L".
A monofin that slips off the skin, rather than one sealed inside.
Instructions for getting out of the tail.
A seller you can contact, with a returns route.

Be wary of a listing that calls a tail "easy" or "for all swimmers". A tail makes swimming harder, not easier.

Where and how a child should use it

A pool only. RLSSA does not recommend tails in open water. See Pool or open water?
An adult within reach, watching only them. See Never alone.
A known depth, starting where they can stand. Australia's regulator notes tails are made for pools deep enough to swim in, not paddling-shallow water, so pick a depth your child knows and can stand up in until they can free their feet quickly.
No somersaults, races or long swims, which RLSSA advises against, and no over-breathing before going under, which it also warns against. We add: no breath-holding games. See Breath-holding games.
Check the pool's rules. Some public pools have banned tails. In January 2016, YMCA was reported to have banned them at the pools it manages in Victoria, Australia.

Condition checks before every swim

A damaged tail can fail at the wrong moment. Take a minute before each swim.

Fin: no cracks, splits or white stress marks in the plastic.
Foot pockets: not torn, not stretched loose.
Skin: seams intact, no holes near the feet, elastic still firm.
Fit: still right for your child's size today.

If anything is damaged, stop using it and contact the maker.

Care

Rinse in fresh water after every swim, including the foot pockets.
Dry in the shade. Sunlight wears down fabric and plastic.
Store the fin flat. Do not stand it on its blade or leave it in a hot car.
No walking on the fin around the pool. It cracks and it slips.

Common mistakes

Buying a costume tail and letting a child swim in it.
Choosing a tail to grow into.
Skipping the removal test because the child is "a good swimmer".
Lending the tail to a friend whose swimming you do not know.
Taking a new tail straight to the sea on holiday. See Mermaiding on holiday.

What to ask a seller

What age, weight and swimming ability is it made for?
Is the monofin removable from the skin?
How does a child get out of it in the water?
What safety warnings come with it?
Can I return it if it does not fit?

For safety around the whole family, see Mermaiding for children: a guide for parents.

General information, not a substitute for instruction or medical advice. If you have a health condition, check with your doctor before getting in the water.