Sun TailsMermaid Monofin - Swim Fin in Kid and Adult Sizes

Be sure to read up on the proper use of this before using. My son nearly drowned using this for the first time. Product description was vague on sizing. He is 4 foot 11 and 12 years old so I wasn't sure what size to get him. Technically he can be in an adult size but safely should have been in a child's size. Fin is heavier in the water and it dragged him down when he tried to stand up in the water. He learned through trial and error that the best way to stand up on a shallow pool floor is to lay flat on your back to cause the fin to float up and then stand up. After that, he just had fun with the adult one instead of the child one. Easy to put on. One tip: lube your feet to make it easier to slip on. I learned that from a show called Merpeople. Good tip. Easier to slip off when wet that way.

I bought the adult mono fin for my granddaughter and now have to order the Wonder Woman skin! That was incredibly fast shipping and she got it today and hasn’t left the pool! Thank you so much for the necklace as she loves it too!!!

My daughter loves her fin. She legitimately thinks she’s a mermaid when wearing it. So far so good. No cracks so far.

It fit nicely and me and my granddaughter each got one with our mermaid tails to swim with thank you

My daughter loved swimming with the fin! Unfortunately after that first day (2 hours) the fabric has ripped. I’m not sure who to contact for a replacement or refund. It’s fun, but a little expensive for a single use itemUpdated: I reached out to the company and was able to get a replacement quickly thanks to the 1 year warranty. They sent a replacement and even suggested tips to keep the tipping from happening again

I usually swim with a Finis Rapid, but wanted something more for fun that wouldn't give me foot cramps. I've used the different versions of the Finfun monofin, but couldn't get enough power from it and felt like I was just wearing a wobbly sock. The SunTail fin has the thicker plastic fin, so I figured power would be much better (and it is). Some issues though:Like the Finfun, the main thing you're pushing against on the downstroke is the neoprene, which stretches and isn't super efficient. The straps on the SunTail (this fin) are a major improvement for me over the FinFun, but I practically have to push my toes against the mid strap to make use of it. The low strap is too far down for any size feet (I wear a 43 usually) and doesn't do much. Friends who have smaller feet and tried it couldn't reach and found the fin to be uncomfortable to swim with. I wish the mid strap connected to the fin between the feet and offered a better method of tensioning the velcro strap.After maybe 8 hours of use total and putting the fin on/off a dozen time, I noticed a split in the seam between the ankle cuff and main section. Easy enough to sew, but it makes me uncomfortable for future failures on more important spots. All in all, I'm pretty happy with my choice, though it really will just be a "comfy loafer" kind of fin for the pool. I'll probably take a crack at modifying it myself and moving the strap to hold my feet better.Fits FinFun and SunTail skins just fine.UPDATE: SunTails reached out after my review was posted and sent a replacement foot pocket almost immediately. Haven't used the new one yet, but I appreciate the immediate attention. As they mention on the listing, the fins are covered against defects for 1 year.

Really like the rigidity of the fin. It’s not hard like glass but just ever so slightly flexible. One can really propel oneself through the water after perfecting one’s “flipper technique.” The sock part is fraying after just a few days of swimming, although neoprene doesn’t hem like other fabrics. We went with the Keiki size for my tween (sz 6 shoe US) but the sock is difficult to put on once her feet are wet, perhaps due to wide feet and being on the upper end of the size scale. We have no problem cinching the fin into the sock with the Velcro and the straps work quite well for us.Ideally there would be a medium sock offered with the Keiki fin. But I’ll exchange the current one under warranty when it rips completely.

Update: 9/25: Seller offered replacement or full refund. Chose the refund and it was issued within hours. I believe that this was just one faulty product and I will definitely consider ordering again next summer. Used by 7 year old 8 times. Worn inside tail and properly dried each time. This happened after 8 uses. Shredded to pieces. No way to fix. The other side is starting. Spent extra to get a quality product.

My daughter was not able to put on the mermaid tail and I wrote an email to the company for help. They get back to me not even an hour later with many tips and things to try before returning the item. Turns out the tips worked perfectly and my daughter is now a very happy mermaid! :)