Your cart
Free US shipping on orders over $100. Easy returns.
International Shipping now available!
Give $20, get $20. Win win.
Buy more, save money
Power micromesh is surprisingly supportive [Aube 1]
Triangle cut is low coverage in the front and sides [Aube 1]
Sieve Triangle Bra in Black
Adjustable hook and eye and strap sliders in the back [Aube 1]
Hannah is a 36DD in our size 4 [Hannah 4]
The back of the bra can be adjusted tighter or looser [Hannah 4]
Wide elastic bland is comfortable and supportive
flat
  • 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
  • Thumbnail image #4 of Sieve Triangle Bra in Black [Aube 1]
  • 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
Buy more, save money
Power micromesh is surprisingly supportive [Aube 1] Triangle cut is low coverage in the front and sides [Aube 1] Sieve Triangle Bra in Black Adjustable hook and eye and strap sliders in the back [Aube 1] Hannah is a 36DD in our size 4 [Hannah 4] The back of the bra can be adjusted tighter or looser [Hannah 4] Wide elastic bland is comfortable and supportive

Sieve Triangle Bra

4.5
Rated 4.5 out of 5 stars
1,740 Reviews

Surprising support. Deep v neckline.


Our signature Sieve mesh in a lower coverage triangle cut. Great shape - no pad or wire included.  Create a custom 2 Pack ->
NEW

Buy more, save $

Free U.S. shipping on orders over $100. Easy returns.

Fit

  • Size Chart
  • Use this as a guide. Preference is a huge factor — if you're near the top of a size range and/or prefer more coverage, you may want to size up.
  • Triangle cut has lower coverage in both the cups and the sides. 

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 String Thong in Black Sieve String Thong in Black (alternate view) Sieve String Thong in Black $30
Cotton French Cut Brief in Black (Pack) Cotton French Cut Brief in Black (Pack) (alternate view) Cotton French Cut Brief in Black (Pack) $58 +
Whipped Boy Short in Black Whipped Boy Short in Black (alternate view) Whipped Boy Short in Black $45 +
Sieve High-Waist Brief in Black Sieve High-Waist Brief in Black (alternate view) Sieve High-Waist Brief in Black $45
4.5
Rated 4.5 out of 5 stars
Based on 1,740 reviews
Write a Review (Opens in a new window)
1,740 reviews
  • Sarah L.
    Verified Buyer
    Size Purchased 1
    How it Fits True to Size
    Age Range 25 - 34
    Bra Size 32C
    4 minutes ago
    Size Purchased 1
    How it Fits True to Size
    Age Range 25 - 34
    Bra Size 32C
    Sieve Triangle Bra in Buff
    Reviewing
    Sieve Triangle Bra in Buff
    Rated 5 out of 5 stars
    Great bra

    This is my first time trying Negative bras, and they really live up to the hype! Great quality and very supportive. I decided to go with the glace material instead of the sieve as I am planning to wear this with white shirts and want a bit more coverage around the nip area.

    Was this helpful?
  • Cherry S.
    Verified Buyer
    Size Purchased 3
    How it Fits True to Size
    Age Range 65+
    Bra Size 34DD/E
    6 hours ago
    Size Purchased 3
    How it Fits True to Size
    Age Range 65+
    Bra Size 34DD/E
    Sieve Triangle Bra in Cherry
    Reviewing
    Sieve Triangle Bra in Cherry
    Rated 5 out of 5 stars
    LOVE

    So pretty...comfortable...love the style.

    Was this helpful?
  • Sean D.
    Verified Buyer
    Size Purchased 5
    How it Fits True to Size
    Age Range 45 - 54
    Bra Size 30DD/E
    17 hours ago
    Size Purchased 5
    How it Fits True to Size
    Age Range 45 - 54
    Bra Size 30DD/E
    Sieve Triangle Bra in Black
    Reviewing
    Sieve Triangle Bra in Black
    Rated 5 out of 5 stars
    Very comfortable and enjoyable.

    Wife loves it. Wants more!

    Was this helpful?
  • Lynnette G.
    Verified Buyer
    Size Purchased 2
    How it Fits True to Size
    Age Range 55 - 64
    Bra Size 32D
    Yesterday
    Size Purchased 2
    How it Fits True to Size
    Age Range 55 - 64
    Bra Size 32D
    Sieve Triangle Bra in Black
    Reviewing
    Sieve Triangle Bra in Black
    Rated 5 out of 5 stars
    Comfortable

    I love it and it is very comfortable…………

    Was this helpful?
  • Darcy H.
    Verified Reviewer
    Size Purchased M
    How it Fits True to Size
    Age Range 45 - 54
    Bra Size 38D
    Yesterday
    Size Purchased M
    How it Fits True to Size
    Age Range 45 - 54
    Bra Size 38D
    Sieve Triangle Bra in Buff
    Reviewing
    Sieve Triangle Bra in Buff
    Rated 5 out of 5 stars
    Best fit

    Bra fits great

    Was this helpful?
Reviews LoadedReviews Added

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

Detail view of Sieve Triangle Bra in Black for sizer

@negativeunderwear