Name: Sieve Demi Bra in Black
Brand: Negative Underwear
Price: 78 USD
Availability: InStock
Rating: 4.7 (1625 reviews)

Details
Fabric + Care
Easy Returns

Made from a sheer Belgian power micromesh — nipples are visible
Underwire bra with max comfort
Velvety plush elastic underband
Heat transferred care label = no itchy tags

Complete the Set

Pair the Sieve Demi Bra with our Sieve Thong or Sieve String Thong for a coordinated everyday set. Crafted from the same sheer Belgian power micromesh, each piece offers lightweight breathability, a smooth, flexible fit, and barely-there comfort.

Underwire, Unlined, Unapologetic

The Sieve Demi Bra brings structured underwire support to our signature Sieve Collection, with unlined, unpadded demi cups for a natural shape. Crafted from sheer Belgian power micromesh (74% nylon, 26% elastane), certified to OEKO-TEX® STANDARD 100, the fabric is transparent, so nipples are visible. A velvety plush elastic underband and tagless heat-transfer care label provide added comfort. Rated 4.7 stars by 1,618 reviewers, with one calling it “your everyday bra but better.” Hand wash warm and dry flat.

Part of the Sieve Collection

The Sieve Demi Bra is part of our signature Sieve Collection, featuring sheer Belgian power micromesh designed for lightweight comfort and a barely-there feel. Explore the full collection, including the Sieve Non-Wire Bra, Sieve Triangle Bra, Sieve Bra Top, and Sieve Cutout Bra, each offering a different fit and level of support. Complete your everyday essentials with the coordinating Sieve Thong.

FAQs

Q: Is the Sieve Demi Bra underwire or wireless?
A: The Sieve Demi Bra features underwire support with unlined, unpadded demi cups for a natural shape and gentle lift. Its lightweight Belgian power micromesh provides a breathable, comfortable fit.

Q: How is band/cup sizing different from Negative's 0–5 non-wire sizing?
A: The Sieve Demi Bra uses traditional bra sizing, with separate band and cup measurements for a more precise fit. Our non-wire styles use a numeric 0–5 sizing system, including extended cup options. Refer to our size chart to find your best fit.

Q: Can I machine wash this bra?
A: We recommend hand washing the Sieve Demi Bra in warm water and laying it flat to dry. Machine washing is not recommended, as gentle care helps preserve the delicate micromesh fabric and fit.

Q: Is the Sieve Demi Bra see-through?
A: Yes, the Sieve Demi Bra is made from sheer Belgian power micromesh with unlined, unpadded cups, so nipples are visible. The lightweight, breathable fabric offers a barely-there feel with comfortable underwire support.

Q: Is this bra padded or lined?
A: No, the Sieve Demi Bra features unlined, unpadded demi cups made from sheer Belgian power micromesh. This lightweight fabric provides a natural shape and breathable comfort, with nipples visible through the material.

74% Polyamide (Nylon) 26% Elastane (Spandex)
Hand wash in warm water, dry flat

All full-priced items (including packs) are eligible for return or exchange within 30 days of the original purchase date.
All last chance items marked with "Final Sale" are not eligible for return or exchange.
Given the delicate nature of what we sell, items must be unworn, unwashed, undamaged, with tags attached and in original packaging to proceed with a return.
Packs must be returned in full.
To help ensure your items are eligible for a return, please check out ‘Try-On Tips’ in our Help Center.
Want more info about shipping, materials or care instructions? Here!

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

4.7

Rated 4.7 out of 5 stars

Based on 1,625 reviews

1,625 reviews

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Kyla S.
Verified Buyer
Size Purchased 36C
How it Fits True to Size
Age Range 35 - 44
4 minutes ago
Size Purchased 36C
How it Fits True to Size
Age Range 35 - 44
Reviewing
Sieve Demi Bra in Black
Rated 5 out of 5 stars
Great bra
I love this bra
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Pair it With

Sieve Demi Bra in Black

Sieve Demi Bra

None of the padding. All the support.

None of the padding. All the support.