The Green Edit - Available April 4
Early Access Thursday 9pm PT
A curated collection of new silhouettes, a soft floral, and our most-loved greens—made to match the pace of Spring.

The Green Edit - Available April 4
Introducing the Lattice
Inspired by our Bows suit—reimagined with a clean, minimal, bow-free finish

The Green Edit - Available April 4
Say Hello to Fleur
Hand-drawn in-house, Fleur is our newest painterly floral—romantic, soft, and exclusive to Sienna Swim.

The Green Edit - Available April 4
Your Favorite Greens Are Back
Emerald, Matcha and Forest return - joined by fresh styles.

Spring Starts Here
Bestsellers, Restocked
Palm, Cherry Wine, Steel, and more — your favorite colors and styles restocked for Spring.


Let customers speak for us
from 377 reviews
I always struggle finding a swimsuit I feel confident in. I have hip dips, so I usually don't feel too confident wearing regular bikinis. This is my 4th suit from Sienna Swim and actually my favorite!!! It looks so flattering, snatches my waist, and I look to feminine and confident! It sits a little higher over the waist and pulls the focus on the top half of the suit. Love it!

So flattering!!! Great material and adjustable

So soft and perfect size, can’t wait to enjoy it for summer ✨🖤

They’re very true to size

Super flattering! I have it in green and white now! I need every color!

I LOVE this one piece. This is my 2nd one piece ive purchased from here and the quality is 10/10, and the style/ comfort is a 10/10. In total I have 13+ bathingsuits from Sienna Swim, I need a model/sponsor LOL

I’m a size 36/D, the cup size in this is a little smaller, i sized upa and it is so flattering, so i would size up, but it’s such good quality and so so cute. Fit was so flattering!

Great quality, cute fit, amazing customer service. Thank you, Sienna! <3

Im a D cup and it’s such a flattering top!!
The quality is seriously unmatched. Couldn’t recommend enough

Absolutely love the isla design it’s so cute. I got a size medium and I’m 5’1 & weigh around 150-155lbs! Sienna did her job with this one fr. It’s perfect for tanning with the coverage it gives. It’s adjustable too that’s always a plus! I got the matching top too. I didnt have too many pics of this on though. But I’ll definitely order more of this style for the summer or vacation (:

I ordered this during the holidays yet it still shipped out pretty quickly! I ordered this for my trip to Maui and I got so many compliments on it! I got a size Medium. Which I believe sienna wears a medium for the one pieces too. I am 5’1 & around 155lbs for reference. I have more of a wider back so I love the open back on this! I do have a longer torso shorter legs so typically other one pieces fit weird on me but this one doesn’t! It has a nice stretch to it obviously meant to swim in but you can definitely wear it for a casual wear too! Pair with jeans or shorts. Anyway I’m a big fan of Sienna!! <3

i LOVE this swimsuit. so pretty and flattering and i was so so so impressed by the quality. Definitely would recommend this style

Best bathing suit I’ve ever spent my money on. I don’t think I will ever love any other bikini as much as this one. So beautiful.

So freaking smooth

Love the material