Seriously comfy and universally flattering on all sizes. "Must have" is an understatement.
Fabric Guide
BioSculpt
Plant-based raw material sourced from castor bean.
• Organic alternative to fossil fuel based nylon
• Extra lycra content for strategic support
EcoLux
Made from a blend of recycled nylon and Lycra.
• Superfine matte jersey
• Superior stretch
EcoTex
Made from a nylon and Lycra blend.
• Superfine, scrunchie, touch-me texture
• Sustainably made in California
EcoCotton
Made from a blend of recycled cotton and Tencel.
• A super soft and lightweight knit
• Sustainably made in California
EcoRib
A sexy, stretch-ribbed fabric made from recycled Nylon fabric scraps.
• Lightweight, breathable + form flattering
• Production saves 33 liters of water/meter of fabric
• Sustainably made in California
EcoLinen
Made from 100% Linen.
• Breathable
• Earth friendly + biodegradable
Organic Rib
Made from a blend of sustainable Tencel, organic cotton, and Spandex.
• Super soft
• For texturized, ribbed beachwear
• Sustainably made in California
• GOTS Certified Organic Cotton
• OEKO-TEX certified, Non-Toxic + low impact dyes
Metallic
Made from a Nylon, Spandex, and Metalized Polyester blend.
• Silky soft
• Jersey Stretch
EcoSoft
A super soft plant-based fleece blend made from 60% hemp and 40% organic cotton.
• 99% Compostable and biodegradable
• GOTS Certified Organic Cotton
• Organically grown without pesticides
• OEKO-TEX certified, non-toxic + low impact dyes
Fabric:
Essential Colors:
Limited Edition:
Find My Size
Sienna Tank - White OceanRib
Coverage:
Size 10-12 tops are constructed with more depth to accommodate D-DD cup sizes. For A and small B cups, try wearing back to front, for instant cleavage.
• Pullover
• Wide underbust band
• Fully lined
Model is 5'11", 36B and is wearing a size M.
Still not sure about fit or style? Start a Live Chat with our fit experts.
Fit Finder
Measuring Guide
Size Chart
Enter your measurements below to find your recommended size.
| Size | XS | S | M | L | XL | 14 |
| US Size | 4 | 6 | 8 | 10 | 12 | 14 |
| Underbust | 28 - 29 | 30 - 31 | 32 - 33 | 34 - 35 | 36 - 37 | 37 - 38 |
| Cup | A | B | C | D | DD | DD |
| Size | US | UK | EU | AU |
| XS | 2 - 4 | 6 - 8 | 32 - 34 | 4 - 6 |
| S | 6 | 10 | 34 - 35 | 6 - 8 |
| M | 8 | 12 | 35 - 36 | 10 - 12 |
| L | 10 | 14 | 36 - 37 | 12 - 14 |
| XL | 12 | 16 | 37 - 38 | 14 - 16 |
Still not sure about the fit or style? We’re here to help!
Size 10-12 tops are constructed with more depth to accommodate D-DD cup sizes. For A and small B cups, try wearing back to front, for instant cleavage.
• Pullover
• Wide underbust band
• Fully lined
Model is 5'11", 36B and is wearing a size M.
Still not sure about fit or style? Start a with our fit experts.
Handwash in cold water, dry flat. Learn More.
83% Recycled Polyester + 17% Spandex
In our mission to cut plastic, this product comes in biodegradable and recyclable packaging.
Styled by You
Show us how you style your #VitaminAswim
| Fit |
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
|
| Quality |
Rated 4 out of 5
|
| Support |
Rated 3 out of 5
|
Great color
Love the color. Love the fabric. Love that it's eco-friendly. Runs a bit small.
| Fit |
Rated -1 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
|
|---|---|
| Quality |
Rated 5 out of 5
|
| Support |
Rated 4 out of 5
|
Vitamin A Swim
Hi Marina,
So glad to hear you are loving the Sienna Tank.
xx
My favorite!
I have this top and the matching Midori bottoms in 5 different colors. I’m 30 years old with a semi athletic build, 34C cup size. The large size in both tops and bottoms fit me perfectly! I love surfing and going to the beach in this suit all summer long. It’s supportive, flattering, sexy and keeps everything in place. Vitamin A is the only brand of bathing suits I own. Nothing else compares!
| Fit |
Rated -1 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
|
|---|---|
| Quality |
Rated 5 out of 5
|
| Support |
Rated 5 out of 5
|
Vitamin A Swim
Hi Jamie,
The Sienna Top paired with the Midori bottom is a match made in heaven :) We appreciate your continued support.
xx
Love the fit and color
I'm normally a 34C and this top in M fit perfectly. The band is not too tight and the straps are not too long which is a problem I see a lot of at my short height. My only critique is that the material is so light and it's beautiful but thin so I would be nice to have removal pad options.
| Fit |
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
|
|---|---|
| Quality |
Rated 4 out of 5
|
| Support |
Rated 2 out of 5
|
Vitamin A Swim
Hi Kimberli,
We appreciate your feedback! 💛
xx
Sustainability is Sexy
Sustainability is Sexy
Our Promise
We believe style + sustainability are inseparable. All of our bikinis and bodysuits are sustainably made in California, from plant-based and recycled materials.
Super Natural.
As a proud member of 1% For the Planet, we give back to organizations who work to protect our oceans and the environment.
