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131 products
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Bras + Underwear Bras
None of the padding. All the support.
Airy light and surprisingly strong — it’s not impossible, we made it.
*411*
- 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.
*FABRIC*
- 74% Polyamide (Nylon) 26% Elastane (Spandex)
- Hand wash in warm water, dry flat
Next level soft. Our #1 non-wire cut.
So comfortable you can nap in it, so cute you’ll wanna tell all your friends about it. This is the perfect lounge bra.
*411*
- 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
- Depending on how much coverage you like, size up or down accordingly
*FABRIC*
- Wispy soft micro modal stretch fabric imported from Austria
- Cerise is a rich and moody dried rose petal red tone
- Drop-needle stitch creates a subtle, vertical stripe effect
- Lined in the front for more opacity
- 91% Micro Modal 9% Lycra
- Certified Safe: OEKO-TEX® STANDARD 100 #23.HCN.86212 by Hohenstein HTTI
- Machine wash warm, no bleach, tumble dry low, cool iron, wear often
Deep plunge neckline. High gloss sheen.
A wireless, ultra-luxe triangle bralette: comfortable for day, glam for night, perfect for always.
*411*
- 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
- Depending on how much coverage you like, size up or down accordingly
*FABRIC*
- Ultra luxe Belgian stretch nylon with the glossy feel and sheen of silk
- Cerise is a rich and moody dried rose petal red tone
- Double layered in the cups for extreme comfort
- Wide plush elastic band for added support
- Adjustable straps and hook & eye closure in the back
- Wireless
- 23% Lycra and 77% Nylon
-
Certified Safe: OEKO-TEX® STANDARD 100 #23.HCN.86212 by Hohenstein HTTI
- Machine wash warm, hang dry, wear often
Next level soft. Our #1 non-wire cut.
So comfortable you can nap in it, so cute you’ll wanna tell all your friends about it. This is the perfect lounge bra.
*411*
- 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
- Depending on how much coverage you like, size up or down accordingly
*FABRIC*
- Wispy soft micro modal stretch fabric imported from Austria
- Maritime is a nautical rich blue pinstripe on a cream-white base.
-
Drop-needle stitch creates a subtle, vertical stripe effect
- Lined in the front for more opacity
- 73% Micromodal, 17% Polyester, 10% Lycra
- A small amount of polyester helps keep the stripe pattern sharp and prevents colors from running in the wash. Our solid Whipped fabric remains polyester-free.
- Certified Safe: OEKO-TEX® STANDARD 100 #23.HCN.86212 by Hohenstein HTTI
-
Machine wash warm, no bleach, tumble dry low, cool iron, wear often
None of the padding. All the support.
Airy light and surprisingly strong — it’s not impossible, we made it.
*411*
- Underwire bra with max comfort
- Velvety plush elastic underband
- Heat transferred care label = no itchy tags
*FABRIC*
- 74% Polyamide (Nylon) 26% Elastane (Spandex)
- Babe is a pink lemonade bubblegum tone
- Made from a sheer Belgian power micromesh - nipples are visible
- Hand wash in warm water, dry flat
The perfect strapless bra. High gloss fabric.
A flattering, supportive, and comfortable strapless bra that can be worn 18 different ways, under absolutely anything.
*411*
- Multiway adjustable straps can be worn 18 ways
- Spandex grip lining to keep it in place
- Thin memory foam pads mold to your body
- 4 row hook and eye
- Underwire bra with max comfort
- No nipple visibility
*FABRIC*
- 77% Polyamide (Nylon) 23% Elastane
- Buff is a caramel-y sunrise desert sands affogato tone
- Certified Safe: OEKO-TEX® STANDARD 100 #HK020 196895 by TESTEX AG
- Hand wash in warm water, hang dry
- *Note, avoid squeezing/wringing out cups (they’re memory foam, after all!)
The perfect strapless bra. High gloss fabric.
A flattering, supportive, and comfortable strapless bra that can be worn 18 different ways, under absolutely anything.
*411*
- Multiway adjustable straps can be worn 18 ways
- Spandex grip lining to keep it in place
- Thin memory foam pads mold to your body
- 4 row hook and eye
- Underwire bra with max comfort
- No nipple visibility
*FABRIC*
- 77% Polyamide (Nylon) 23% Elastane
- Black is a raven deep noir tone
- Certified Safe: OEKO-TEX® STANDARD 100 #HK020 196895 by TESTEX AG
- Hand wash in warm water, hang dry
- *Note, avoid squeezing/wringing out cups (they’re memory foam, after all!)
Best selling mesh. Cutout center.
Our most minimal cut. All the support, comfort, and smoothing sheerness you love about our Sieve Non-Wire, minus the center.
*411*
- 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.
- Adjustable hook & eye closure and straps
*FABRIC*
- Made from a sheer Belgian power micromesh - nipples are visible
-
Cobalt is an electric lost at sea rich sapphire blue
- 74% Polyamide (Nylon) 26% Elastane (Spandex)
- Certified Safe: OEKO-TEX® STANDARD 100 #23.HCN.86212 by Hohenstein HTTI
- Machine wash warm, hang dry, wear often.
Classic pasties. Invisible under everything.
A simple and easy-to-wear pastie, great under a sheer bra or on its own. Zero adhesives means no stickiness or loss of grip.
*411*
- Ultra thin edges seamlessly blend with skin
- Wear them on their own or layer under a sheer bra
- Sticks on with natural body heat
*FABRIC*
- 100% silicone is soft and flexible
- Fawn is an earthy cinnamon powder rich terracotta shade
- Diameter: 9 cm/ 3.5 inches
- Hand wash cold with mild soap, air dry face down, have fun
Smooth and seamless. Thin memory foam padding.
Rated “Best T-Shirt Bra” by New York Magazine. This underwire bra ticks all best-in-class t-shirt bra boxes but still feels beautiful and sophisticated.
*411*
- Full coverage + significant support
- Thin memory foam pads mold to your body
- Underwire bra with max comfort
- No nipple visibility
*FABRIC*
- 74% Polyamide (Nylon) 26% Elastane
- A caramel-y sunrise desert sands affogato tone
- Hand wash in cold water, dry flat
- *Note, avoid squeezing/wringing out cups (they’re memory foam, after all!)
Sporty meets sheer. Surprising support.
Micromesh gives an unexpected take on a sports bra-like cut. Smoothing scoop neck wireless pullover with no band or strap hardware.
*411*
- 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.
*FABRIC*
- Made from a sheer Belgian power micromesh - nipples are visible
- Wide plush elastic band for added support
- Wireless pullover design - aka no hardware
- 74% Polyamide (Nylon) and 26% Elastane (Spandex)
- Certified Safe: OEKO-TEX® STANDARD 100 #23.HCN.86212 by Hohenstein HTTI
- Wash on delicates/cold, dry flat
Surprising support. Deep v neckline.
Our signature Sieve mesh in a lower coverage triangle cut. Great shape - no pad or wire included.
*411*
- 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*
- Made from a sheer Belgian power micromesh — nipples are visible
- A caramel-y sunrise desert sands affogato tone with white trim
- 74% Polyamide (Nylon) 26% Elastane (Spandex)
- Wireless
- Certified Safe: OEKO-TEX® STANDARD 100 #23.HCN.86212 by Hohenstein HTTI
- Hand wash in cold water, dry flat
Sporty cozy. Inexplicably soft.
Wireless pullover scoop neck bralette in the softest micromodal. If you were to sleep in a bra, this is that bra.
*411*
- 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
- Depending on how much coverage you like, size up or down accordingly
*FABRIC*
- Wispy soft micro modal stretch fabric imported from Austria
- Drop-needle stitch creates a subtle, vertical stripe effect
- Lined in the front for more opacity, unlined in the back
- Fabric provides ample stretch for a pullover design
- Zero hardware: no underwire, no hook & eye, no strap sliders
- 91% Micro Modal 9% Lycra
- Certified Safe: OEKO-TEX® STANDARD 100 #23.HCN.86212 by Hohenstein HTTI
- Wash on cold/delicates, dry flat
- Do not bleach
Next level soft. Our #1 non-wire cut.
So comfortable you can nap in it, so cute you’ll wanna tell all your friends about it. This is the perfect lounge bra.
*411*
- 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
- Depending on how much coverage you like, size up or down accordingly
*FABRIC*
- Wispy soft micro modal stretch fabric imported from Austria
- Drop-needle stitch creates a subtle, vertical stripe effect
- Lined in the front for more opacity
- 91% Micro Modal 9% Lycra
- Certified Safe: OEKO-TEX® STANDARD 100 #23.HCN.86212 by Hohenstein HTTI
- Wash on cold/delicates, dry flat
- Do not bleach
Sporty meets sheer. Surprising support.
Micromesh gives an unexpected take on a sports bra like-cut. Smoothing scoop neck wireless pullover with no band or strap hardware.
*411*
- 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.
*FABRIC*
- Made from sheer Belgian power micromesh — nipples are visible
- A caramel-y sunrise desert sands affogato tone
- Wide plush elastic band for added support
- Wireless pullover design - aka no hardware
- 74% Polyamide (Nylon) 26% Elastane (Spandex)
- Certified Safe: OEKO-TEX® STANDARD 100 #23.HCN.86212 by Hohenstein HTTI
- Hand wash in cold water, dry flat