Your cart
Free US shipping on orders over $100. Easy returns.
International Shipping now available!
Give $20, get $20. Win win.
Triangle cut is low coverage at the front and sides [Giselle 1]
Moon is a pale silvery grey tone [Giselle 1]
Sieve Triangle Bra in Moon
Adjustable hook & eye and strap sliders in the back [Giselle 1]
A triangle bra and low rise thong in our signature micromesh [Giselle 1]
flat
  • Thumbnail image #1 of Sieve Triangle Bra in Moon [Giselle 1]
  • Thumbnail image #2 of Sieve Triangle Bra in Moon [Giselle 1]
  • Thumbnail image #3 of Sieve Triangle Bra in Moon
  • Thumbnail image #4 of Sieve Triangle Bra in Moon [Giselle 1]
  • Thumbnail image #5 of Sieve Triangle Bra in Moon [Giselle 1]
Triangle cut is low coverage at the front and sides [Giselle 1] Moon is a pale silvery grey tone [Giselle 1] Sieve Triangle Bra in Moon Adjustable hook & eye and strap sliders in the back [Giselle 1] A triangle bra and low rise thong in our signature micromesh [Giselle 1]

Sieve Triangle Bra

4.5
Rated 4.5 out of 5 stars
1,748 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

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
  • A soft silvery cloud lunar dust baby bunny ears tone
  • 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 Moon Sieve High-Waist Brief in Moon (alternate view) Sieve High-Waist Brief in Moon $45
Whipped High Rise in Moon Whipped High Rise in Moon (alternate view) Whipped High Rise in Moon $45
Whipped Boy Short in Moon Whipped Boy Short in Moon (alternate view) Whipped Boy Short in Moon $45
Whipped Slip Dress in Moon Whipped Slip Dress in Moon (alternate view) Whipped Slip Dress in Moon $85
4.5
Rated 4.5 out of 5 stars
Based on 1,748 reviews
Write a Review (Opens in a new window)
1,748 reviews
  • Kami H.
    Verified Buyer
    Size Purchased 3
    How it Fits True to Size
    Age Range 35 - 44
    Bra Size 36C
    4 minutes ago
    Size Purchased 3
    How it Fits True to Size
    Age Range 35 - 44
    Bra Size 36C
    Sieve Triangle Bra in Cherry
    Reviewing
    Sieve Triangle Bra in Cherry
    Rated 5 out of 5 stars
    Comfortable!

    This bra is so comfortable

    Was this helpful?
  • Ellen B.
    Verified Buyer
    Size Purchased 5
    How it Fits True to Size
    Age Range 65+
    Bra Size 38C
    2 hours ago
    Size Purchased 5
    How it Fits True to Size
    Age Range 65+
    Bra Size 38C
    Sieve Triangle Bra in Buff
    Reviewing
    Sieve Triangle Bra in Buff
    Rated 5 out of 5 stars
    Bought the white boa and buff.

    Love the bras.

    Was this helpful?
  • Ellen B.
    Verified Buyer
    Size Purchased 5
    How it Fits True to Size
    Age Range 65+
    Bra Size 38C
    2 hours ago
    Size Purchased 5
    How it Fits True to Size
    Age Range 65+
    Bra Size 38C
    Sieve Triangle Bra in White Boa
    Reviewing
    Sieve Triangle Bra in White Boa
    Rated 5 out of 5 stars
    Love the Sieve Triangle bra.

    The reduced cut is both comfortable and sensual. I’m a size 38C, sized up to a 5, glad I did.

    Was this helpful?
  • Kathleen S.
    Verified Buyer
    Size Purchased 5
    How it Fits True to Size
    Age Range 18 - 24
    Bra Size 40C
    2 hours ago
    Size Purchased 5
    How it Fits True to Size
    Age Range 18 - 24
    Bra Size 40C
    Sieve Triangle Bra in Buff + White
    Reviewing
    Sieve Triangle Bra in Buff + White
    Rated 5 out of 5 stars
    Love!

    Super pretty and flattering

    Was this helpful?
  • Mallory D.
    Verified Buyer
    Size Purchased 5
    How it Fits True to Size
    Age Range 25 - 34
    Bra Size 40C
    21 hours ago
    Size Purchased 5
    How it Fits True to Size
    Age Range 25 - 34
    Bra Size 40C
    Sieve Triangle Bra in Black
    Reviewing
    Sieve Triangle Bra in Black
    Rated 5 out of 5 stars
    Great alternative to underwire bras

    I tried this bra because I was looking for one that gave the same level of lift, but without an underwire, and this one did the trick! It is so comfortable and looks 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 Moon for sizer

@negativeunderwear