I'm not sure if this counts as furry, but I won't make a habit of posting this kinda thing, so don't worry Weasyl!
This is something i've been wanting to do for longer than I can remember - my first time swimming with a mermaid tail that I purchased some years ago from The Mertailor (Eric Ducharme). It's only recently that i've moved into a house with a pool, and i've been saving this moment until Summer (downunder)!
As you can probably see, the fit is not perfect and this is one of the older 'neoprin' and latex tails, so it tends to slip down during swimming... but still, quite visually impressive and a lot of fun to swim with.
Really looking forward to commissioning a silicone tail at some point in the future, probably from another maker.
Here's a video of me swimming with the tail: https://youtu.be/9phHp60sngs
Big thanks to ashtraska for the photography!