Sieve Triangle Bra in White Boa
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 ->
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
- Tonal medium/pale grey snakeskin print on white base
- 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
- Mallory D.Verified BuyerSize Purchased 5How it Fits True to SizeAge Range 25 - 34Bra Size 40C3 minutes agoSize Purchased 5How it Fits True to SizeAge Range 25 - 34Bra Size 40CReviewingSieve Triangle Bra in BlackRated 5 out of 5 starsGreat 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? - Jennifer J.Verified BuyerSize Purchased 3How it Fits True to SizeAge Range 35 - 44Bra Size 34DD/E11 hours agoSize Purchased 3How it Fits True to SizeAge Range 35 - 44Bra Size 34DD/EReviewingSieve Triangle Bra in SlateRated 5 out of 5 starsWell worth it!
I really love this bra. I have a band measurement of 34”, and a chest measurement of 39” and chose sz 3. I could have probably gone with a 4 and been comfy, but the 3 fits well, supports great and doesn’t squish down my chest. The fabric is soft and the band sits well without digging in or riding up.
Was this helpful? - Tamlya E.Verified BuyerSize Purchased 1How it Fits True to SizeAge Range 55 - 64Bra Size 34BYesterdaySize Purchased 1How it Fits True to SizeAge Range 55 - 64Bra Size 34BReviewingSieve Triangle Bra in BlackRated 5 out of 5 starsMost comfortable bra ever
I was about to give up wearing one altogether until I found Negative. This is a supremely comfortable bra with NO WIRES! Much more supportive than any bralette and classy. Very classy.
Was this helpful? - Angie M.Verified BuyerSize Purchased 3How it Fits True to SizeAge Range 45 - 54Bra Size 34CYesterdaySize Purchased 3How it Fits True to SizeAge Range 45 - 54Bra Size 34CReviewingSieve Triangle Bra in Coral + WhiteRated 5 out of 5 starsComfortable
Loved this new style. Wasn’t sure about the clasp in back as I have gone to not having them but was very comfortable
Was this helpful? - Sarah L.Verified BuyerSize Purchased 1How it Fits True to SizeAge Range 25 - 34Bra Size 32C6 days agoSize Purchased 1How it Fits True to SizeAge Range 25 - 34Bra Size 32CReviewingSieve Triangle Bra in BuffRated 5 out of 5 starsGreat 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.
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Non-Wire Bra Sizing

* 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
