Size Chart

When trying to figure out what size is best, the LENGTH is most important.

Measure from hips to ankles.  There is a tiny elastic at the waist to keep the Shimmertail snug while swimming.  


Shimmertails fit true to size and they stretch both long and wide.






We have had very few returns because Shimmertails stretch comfortably and fit every body type. They are made with high quality swimsuit fabric.   Shimmertails hug at the waist with an elastic waistband, but also stretch by an inch or two so they will last for a few summer as your child grows.  


 Shimmertail Measurements XS (2/4) S (5/6) M (7/8) L (9/10)

XL (11/12)



M Adult




L Adult



A Waist (around)


18 - 21 20 - 24 20.5 - 24.5 21 - 25 25-28 28 - 32 44 - 46


46 - 54 51 - 61 52 - 62 54 - 64 71 - 81 71 - 81 87 - 89
B Body Length (from waist to ankles)


25 28 30 32 36 38 38


64 71 76 81 91 98 98


Shark Tail/Fin Sizing:  Our shark tail/fin is worn slightly higher along the lower back to help support the dorsal fin.   


Shark Tail Measurement XS S M L XL M Adult
A Waist {around waist}


18 - 21 20 - 24 20.5 - 24.5 21 - 25 28 - 32 28 - 32


46 - 54 51 - 61 52 - 62 54 - 64 71 - 81 71 - 81
B Body Length {From waist to ankles}


25 32 34 36 38 42


64 81 86 91 97 107


 Shimmertails and swimsuits fit true to size. 


There is a 15% restocking fee for returns unless you are exchanging, so please check measurements before ordering.


 Mermaid Blankets


How to put on a Shimmertail 




How To Wear: The mermaid swimswear is put on, similar to putting on tights. Roll up fabric down to the ankles, insert feet into fin straps, slide on the ankle starp behind ankles, then pull the Shimmertail fabric up to your waist.

It's best to put it on right next to the pool, then slide into the water. Remember to wear a life jacket and always swim with adult supervision. You can also click on our "videos" link to see how to put the swimwear on, and learn how to swim in it as well.  

Please REMOVE the fin for walking, but slide it on for fantastic swimming! To avoid scratching the swimwear, put it on right next to the pool.  If your costume rips during use from heavy play, you can buy replacement fabric for $24.99



- Use ONLY with adult supervision.

 - To ensure your safety, the Shimmertail Mermaid Swimwear must be worn with a life jacket at       ALL times.

- To reduce the risk of falling, put the Shimmertail Mermaid Swimwear on at the edge of the           pool by sliding feet into the foot straps, then pull up the tail.

- Do NOT use in water that is too deep for your swimming abilities.

- Shimmertails are not life saving devices.


Handling care: Remove fin by folding and pulling out before machine washing it. If the swimwear smells mil-dewy, you can machine wash cold, inside out. Hang dry. Do not use fabric softeners, bleach or iron.

You can contact us by filling out the form below,  sending an email to or writing to the address below.   We respond to email within a few hours if not sooner. 


4045 W 9600 N

Elwood UT 84337