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ANNUAL SALE IS HERE! Save an extra 15% off all orders $250+ Full sale FAQs here

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Power micromesh is surprisingly supportive [Aube 1]
Triangle cut is low coverage in the front and sides [Aube 1]
Adjustable hook and eye and strap sliders in the back[Aube 1]
Wide elastic bland is comfortable and supportive
Hannah is a 36DD in our size 4 [Hannah 4]
Black power micromesh is subtly sheer [Hannah 4]
The back of the bra can be adjusted tighter or looser [Hannah 4]
  • Thumbnail image #1 of Sieve Triangle Bra in Black [Aube 1]
  • Thumbnail image #2 of Sieve Triangle Bra in Black [Aube 1]
  • Thumbnail image #3 of Sieve Triangle Bra in Black [Aube 1]
  • Thumbnail image #4 of Sieve Triangle Bra in Black
  • Thumbnail image #5 of Sieve Triangle Bra in Black [Hannah 4]
  • Thumbnail image #6 of Sieve Triangle Bra in Black [Hannah 4]
  • Thumbnail image #7 of Sieve Triangle Bra in Black [Hannah 4]
Buy more, save money
Product photo #1 of Sieve Triangle Bra in Black [Aube 1] Product photo #2 of Sieve Triangle Bra in Black [Aube 1] Product photo #3 of Sieve Triangle Bra in Black [Aube 1] Product photo #4 of Sieve Triangle Bra in Black Product photo #5 of Sieve Triangle Bra in Black [Hannah 4] Product photo #6 of Sieve Triangle Bra in Black [Hannah 4] Product photo #7 of Sieve Triangle Bra in Black [Hannah 4]

Sieve Triangle Bra

Rated 4.4 out of 5
Based on 628 reviews

Surprising support. Deep v neckline.


Our signature Sieve mesh in a lower coverage triangle cut. 
SALESALE

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Free shipping over $100. Easy Returns.

Fit

  • Size Chart
  • Use this as a guide. Preference is a huge factor — the benefit of a non-wire is they're super flexible, so you will likely fit in more than one size. Like a looser band? Size up! Like less coverage? Size down! Still unsure? Try two sizes :)
  • Adjustable straps and hook & eye closure in the back
  • *Note, our Sieve Triangle Bra is an intentionally lower coverage in both the cups and the sides. Wide plush elastic band is extremely adaptable.

Fabric + Care

  • Size Chart
  • Made from a sheer Belgian power micromesh — nipples are visible
  • 74% Polyamide (Nylon) 26% Elastane (Spandex)
  • Hand wash in cold water, dry flat

FAQ

  • Price slashed, Annual Sale items with a red SALE tag are final sale. Full priced items and packs purchased with the 15% off discount are eligible for refund, credit or exchange. For more info on our sale policies ->
  • All full-priced, unworn items, with tags attached and in their original packaging are eligible for return or exchange within 30 days of placing your order.
  • Please note, packs must be returned in full. We do not accept partial returns of packs.
  • Want to know our full returns policies? Here you go.
  • Want more info about shipping, materials or care instructions? Here!

    Q’s on fit or sizing? Email us at hello@negativeunderwear.com

Pair it with ->

Sieve High-Waist Brief in Black Sieve High-Waist Brief in Black Sieve High-Waist Brief in Black $45 +
Only a few left!
Whipped Boy Short in Black Whipped Boy Short in Black Whipped Boy Short in Black $45 +
Sieve Thong in Black Sieve Thong in Black Sieve Thong in Black $32 +
Cotton Mini Boy Short in Black Cotton Mini Boy Short in Black Cotton Mini Boy Short in Black $45
Write a Review
average rating 4.4 out of 5
Based on 628 reviews
  • 5 Stars
    437 Reviews
  • 4 Stars
    77 Reviews
  • 3 Stars
    63 Reviews
  • 2 Stars
    35 Reviews
  • 1 Star
    16 Reviews
88% of reviewers would recommend this product to a friend
Overall
Rated -1 on a scale of minus 2 to 2, where minus 2 is Hated it, 0 is Meh and 2 is Loved it
Quality
Rated 4 out of 5
Comfort
Rated 4 out of 5
628 Reviews
Reviewed by Sarah
Verified Buyer
Review posted
Sieve Triangle Bra in Coral
Reviewing
Sieve Triangle Bra in Coral
I don't recommend this product
Rated 2 out of 5
Size Purchased
1
How it Fits
True to Size
Age Range
25 - 34
Bra Size
34B

Disappointed

This bra was very comfortable, but after maybe a dozen wears and two cold water hand washes (air drying flat) the band is fraying. I cannot imagine what would have caught the fabric, it was washed with a couple of non medical marks each time in a shallow smooth plastic wash basin used exclusively for hand washing. It bums me out every time I see it. This bra was part of my pilot Negative purchase, and I do not intend to purchase from this brand again.

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Overall
Rated -1 on a scale of minus 2 to 2, where minus 2 is Hated it, 0 is Meh and 2 is Loved it
Quality
Rated 2 out of 5
Comfort
Rated 4 out of 5
Was this helpful?
Reviewed by Brian H.
Verified Buyer
Review posted
Sieve Triangle Bra in Coral
Reviewing
Sieve Triangle Bra in Coral
I don't recommend this product
Rated 3 out of 5
Size Purchased
5
How it Fits
True to Size
Age Range
55 - 64
Bra Size
40C

Too Expensive

The bottom strap does not maintain its structure it crumples up and stays crumpled up until you wash it. It comfortable until the bottom strap crumples under your Breasts. And way too expensive !

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Overall
Rated 0 on a scale of minus 2 to 2, where minus 2 is Hated it, 0 is Meh and 2 is Loved it
Quality
Rated 2 out of 5
Comfort
Rated 2 out of 5
Was this helpful?
Reviewed by jennifer m.
Verified Buyer
Review posted
Sieve Triangle Bra in Peach
Reviewing
Sieve Triangle Bra in Peach
I recommend this product
Rated 5 out of 5
Size Purchased
4
How it Fits
True to Size
Age Range
55 - 64
Bra Size
38C

No more underwires!

I have worn underwire bras for 45 years...

How refreshing to feel this comfort and support with out them! THANK YOU

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Overall
Rated 2 on a scale of minus 2 to 2, where minus 2 is Hated it, 0 is Meh and 2 is Loved it
Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Was this helpful?

Non-Wire Bra Sizing

Non-Wire Bra Sizing Size Chart

* Non-wire bra sizing can vary by preference and if you're toward the top of a size range and prefer more coverage, you may want to size up. For styles available in + sizes (designed with additional support details for our larger cup customers), we find DD's can be on the cusp - if you prefer more coverage and support, we suggest the + bra equivalent for your band size.

Q’s about sizing or fit? Email us at hello@negativeunderwear.com

@negativeunderwear