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Lavender Keiki (child size) Mermaid Monofin

Regular price $44.95

Did you know? Keiki means "child" in Hawaiian. It's pronounced kee-kee. :)

The Keiki monofins are for use with our M, L, and XL mermaid tail sizes.

Our patented mermaid monofin (swim flipper) is the best monofin available (US Patents 9561401 and 9925416). Not only does it help you swim like a real mermaid, it keeps feet from sliding around, is so comfortable to wear, and won't break.

Unlike other monofins, our swim fins do not require any babying. You can bounce on the tips, push off pool walls, even hop around in them without any fear of the fin breaking -- though you can break so please be careful.

Learn more about our Monofins

Customer Reviews

Based on 5 reviews
Courtney Peterson
Great product. Great service

High quality

Needs an Extra Strap

This is a great monofin! High quality and SUPER fun! However, I have replaced the “feet pockets” twice, over five uses, and the pockets are still lose. An extra strap would help. :)

We are working on a new foot pocket design, stay tuned!


Once i first got my tail i loved it and I totally recommend it but, after and month or two my monofin sock fabric is starting to rip. i have to wait to christmas to get another fin. but over all I LOVE IT!

A Wonderfuly Perfected Monofin

My daughter (5) wanted a mermaid fin so badly. I almost bought one several time from Wal-Mart and Target, but never committed. The ones I saw being used never seem to stay on long enough for the kids to learn how to swim. I researched and came across Sun Tails. This fin is AMAZING! The sock design is pure genius! She loved and so did ALL the kids at her birthday party. I have already recommended Sun Tails to several different people!


My daughter had a monofin from Walmart, but her feet kept falling out and finally the strap broke. Your monofin stays on and she says it feels great. Can barely get her out of the pool to sleep. All the neighbor kids want one and we've referred them all to your store.