Your cart

International Shipping now available!

Free U.S. shipping on orders over $100, free exchanges, easy returns

[Aube 1]
[Aube 1]
[Aube 1]
Wide elastic bland is comfortable and supportive
[Hannah 4]
[Hannah 4]
[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]
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 4.5 out of 5
196 Reviews

Surprising support. Deep v neckline.

Our signature Sieve mesh in a lower coverage triangle cut.
 

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

  • All unworn items, with tags attached and in their original packaging are eligible for return or exchange within 21 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 Thong in Black Sieve Thong in Black
Sieve Thong in Black $30 +
Rated 4.7 out of 5
125 Reviews
Cotton French Cut Brief in Black Cotton French Cut Brief in Black
Cotton French Cut Brief in Black $22 +
Cotton Thong in Black Cotton Thong in Black
Cotton Thong in Black $22 +
Rated 4.7 out of 5
66 Reviews
Whipped Boy Short in Black Whipped Boy Short in Black
Whipped Boy Short in Black $45 +
Rated 4.7 out of 5
98 Reviews
Write a Review
average rating 4.5 out of 5
Based on 196 reviews
  • 5 Stars
    132 Reviews
  • 4 Stars
    32 Reviews
  • 3 Stars
    29 Reviews
  • 2 Stars
    2 Reviews
  • 1 Star
    1 Review
93% of reviewers would recommend this product to a friend
Overall
Rated -1 on a scale of minus 2 to 2, where minus 2 is Loved it, 0 is Meh and 2 is Hated it
Quality
Rated 4 out of 5
Comfort
Rated 4 out of 5
196 Reviews
Reviewed by Heidi H.
Verified Buyer
Sieve Triangle Bra in Buff
Reviewing
Sieve Triangle Bra in Buff
I recommend this product
Size Purchased
1
How it Fits
True to Size
Age
35 - 44
Bra Size
30D
Rated 5 out of 5
Review posted

LOVE THIS BRA!

very comfortable. Great fit. ordering again in another color.

Loading...
Overall
Rated -2 on a scale of minus 2 to 2, where minus 2 is Loved it, 0 is Meh and 2 is Hated it
Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Was this helpful?
Reviewed by Kathleen C.
Verified Buyer
Sieve Triangle Bra in Black
Reviewing
Sieve Triangle Bra in Black
I recommend this product
Size Purchased
M
How it Fits
True to Size
Age
25 - 34
Bra Size
34C
Rated 3 out of 5
Review posted

Triangle Bra - super cute

This bra is super cute and it fits well, but it’s not quite as comfortable as I wanted it to be.

Loading...
Overall
Rated -1 on a scale of minus 2 to 2, where minus 2 is Loved it, 0 is Meh and 2 is Hated it
Quality
Rated 5 out of 5
Comfort
Rated 3 out of 5
Was this helpful?
Reviewed by Elizabeth B.
Verified Buyer
Sieve Triangle Bra in Slate
Reviewing
Sieve Triangle Bra in Slate
I recommend this product
Size Purchased
2
How it Fits
A Little Small
Age
45 - 54
Bra Size
32DD/E
Rated 5 out of 5
Review posted

Love this Bra!

Sleek and sexy, I love this new bra. The color is gorgeous too! I wear 32DD and order a 2 which is a bit snug but I still love it!

Loading...
Overall
Rated -2 on a scale of minus 2 to 2, where minus 2 is Loved it, 0 is Meh and 2 is Hated it
Quality
Rated 5 out of 5
Comfort
Rated 4 out of 5
Was this helpful?

New color launching soon

Sign up to be first to know!

Non-Wire Bra Sizing

Size Chart

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

@negativeunderwear