Cart
Icon/Bag-Active

Free Tie Dye SIS Tee with every tie dye swim purchase of $175+. Add tee to cart + use code FREETEE at checkout. Excludes International.

Sienna Tank
$135
Rated 4.5 out of 5
Based on 61 reviews

Our Plant Based Swim is ultra-supportive, super stretchy, and made from the castor bean (replacing fossil fuels). Breathable and quick-dry, perfect for water + workouts.

Fabric Guide

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:

Size: Find My Size

Find My Size

Product image

Sienna Tank - Topaz BioSculpt

Coverage:

Less Support More Support

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


Matisse is 5'10", 36DD and is wearing a size XL.


Model is 5'10", 32B and is wearing a size S. 


Still not sure about fit or style? Start a Live Chat with our fit experts.

Fit Finder

Size Chart

Enter your measurements below to find your recommended size.

Measuring Guide

We recommend size:

The size selected is not available.

Still not sure about the fit or style? We’re here to help!

Start a live chat with our fit experts now.

4/XS
6/S
8/M
10/L
12/D/XL
14/DD
Less Support More Support
Fit Details

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


Matisse is 5'10", 36DD and is wearing a size XL.


Model is 5'10", 32B and is wearing a size S. 


Still not sure about fit or style? Start a with our fit experts.

Fabric + Care Instructions

Handwash in cold water, dry flat.


77% Plant-Based Polyamide + 23% Lycra spandex fiber

Sustainability

Our plant-based raw material sourced from the castor bean. BioSculpt is an organic alternative to fossil fuel based nylon fabrics with extra Lycra content for strategic support.

Styled by You

Show us how you style your #VitaminAswim

average rating 4.5 out of 5
Based on 61 reviews
  • 5 Stars
    46 Reviews
  • 4 Stars
    4 Reviews
  • 3 Stars
    6 Reviews
  • 2 Stars
    3 Reviews
  • 1 Star
    2 Reviews
84% of reviewers would recommend this product to a friend
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 5 out of 5
Support
Rated 3 out of 5
61 Reviews
Reviewed by Alyssa
Verified Buyer
I recommend this product
Bra Size
32DD
Height
5' 2"
Size Purchased
8/M
Size Normally Worn
6/S
Rated 3 out of 5
Review posted

Great material and color, not great if you have a larger chest

Pros:

Material is super soft

Beautiful color

Doesn't dig in anywhere

Cons:

I should've been smarter when I bought this product - there's no way it would fit me correctly. It doesn't look bad, but I have a small ribcage and larger breasts (32DD/32DDD) and this doesn't look how I had hoped. The band fits fine, but it doesn't have the space to hold me without the band coming up quite a bit, or without showing off a lot of skin. If I went any larger, I'd have to get it tailored to fit around my ribcage.

I wish I had returned it for a top with an adjustable back. I have zero negative things to say about the quality, just isn't built for people who have a small ribcage and a larger chest. Would still recommend Vitamin A as a brand, just need more options for adjustment.

Loading...
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 2 out of 5
Was this helpful?

Vitamin A Swim

Hi Alyssa,

Thank you for the review! Appreciate the feedback on sizing. Please message customer service chat if you would like some help with style recommendations and sizing.

xx

Reviewed by Elizabeth O.
Verified Buyer
I recommend this product
Bra Size
36A
Height
5' 2"
Rated 5 out of 5
Review posted

Excellent material!

This bathing suit is fantastic quality! It made me feel so comfortable at the beach. The sizing guide was helpful as well!

Loading...
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
Was this helpful?

Vitamin A Swim

Hi Elizabeth,

Thank you for the review. We agree the fabric is so comfy!

xx

Reviewed by Andrea
Verified Buyer
I recommend this product
Bra Size
32D
Height
5' 3"
Size Purchased
10/L
Size Normally Worn
6/S
Rated 5 out of 5
Review posted

LOVE this top

I love the color of this swimsuit, it's very vibrant as seen in the picture. I was afraid that size L would be too big for me as I's usually a size S in tops, but I am on the bustier side (my bra size ranges from 32D to 32E depending on the brand) and I wanted to get more of a modest coverage with this top. The size L turned out to be right for me. Even though I'd prefer the band to be tighter, I knew because it's a size L that it wouldn't be as tight but it's tight enough to keep everything in place and it has enough coverage for me to be comfortable in it. I do think for a size L it's on the smaller side.

Loading...
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
Was this helpful?

Vitamin A Swim

Hi Andrea,

Thank you for leaving a review. We are happy the size worked in your favor and the top fits comfortably. We love how the top feels and fits too. xo

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.

Explore BioSculpt

Explore BioSculpt