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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]
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]
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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]

Sieve Triangle Bra

Rated 4.4 out of 5
Based on 718 reviews

Surprising support. Deep v neckline.


Our signature Sieve mesh in a lower coverage triangle cut. Great shape - no pad or wire included. 
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Free shipping for the holidays. 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)
  • Wireless
  • Hand wash in cold water, dry flat

FAQ

  • 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 +
Cotton French Cut Brief in Black (Pack) Cotton French Cut Brief in Black (Pack) Cotton French Cut Brief in Black (Pack) $58 +
Whipped Boy Short in Black Whipped Boy Short in Black Whipped Boy Short in Black $45 +
Essaouira Thong in Black Essaouira Thong in Black Essaouira Thong in Black $30 +
Write a Review
average rating 4.4 out of 5
Based on 718 reviews
  • 5 Stars
    505 Reviews
  • 4 Stars
    84 Reviews
  • 3 Stars
    73 Reviews
  • 2 Stars
    37 Reviews
  • 1 Star
    19 Reviews
88% of reviewers would recommend this product to a friend
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 4 out of 5
Comfort
Rated 4 out of 5
718 Reviews
Reviewed by Terry C.
Verified Buyer
Review posted
Sieve Triangle Bra in Buff + White
Reviewing
Sieve Triangle Bra in Buff + White
I recommend this product
Rated 5 out of 5
Size Purchased
2
How it Fits
True to Size
Age Range
65+
Bra Size
34D

Sexy and comfortable

So excited to get my second sieve triangle bra. The colors are beautiful and the mesh panel is not only sexy but comfortable. So worth the price for a well made product.

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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?
Reviewed by Charlee G.
Verified Buyer
Review posted
Sieve Triangle Bra in Navy
Reviewing
Sieve Triangle Bra in Navy
I recommend this product
Rated 5 out of 5
Size Purchased
1
How it Fits
True to Size
Age Range
35 - 44
Bra Size
32C

Popular, and I know why

This bra, I wondered how it could be the best seller- but I have one now, and it’s comfortable- sturdy- looks amazing on- and it’s super breathable and light. I’ll be purchasing another.

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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?
Reviewed by Hanna H.
Verified Buyer
Review posted
Sieve Triangle Bra in Black
Reviewing
Sieve Triangle Bra in Black
I recommend this product
Rated 5 out of 5
Size Purchased
2
How it Fits
True to Size
Age Range
35 - 44
Bra Size
34C

Surprisingly supportive and BEAUTIFUL!

The quality will impress you and they’re super supportive. This is my new everyday bra, yes pretty and sexy enough for date night.

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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 4 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.

Btw, the size nomenclature has changed for Bra Tops. Here's the conversion:
XS=0, S=1, M=2, L=3, XL=4, XXL=5

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

@negativeunderwear