Your cart

Free US shipping on orders over $100, easy returns

MK, shown here, is a size 34D bra, wearing a size 3
Pairs perfectly with our Sieve High-Waist Brief in Slate
4-row hook & eye closure allows for a more custom fit
Sieve Non-Wire Bra in Slate

Sieve Non-Wire Bra in Slate

Rated 4.9 out of 5
9 Reviews
That bra you tell all your friends about and don't want to take off? Yup, this is that bra. 
  • Now back in stock(!!!)
  • We've updated our fit - double check size chart
  • Subtly sheer Belgian honeycomb micromesh
  • More shaping and support than you'd expect from a wireless
  • Heat transferred care label = no itchy tags
  • Silky no-slip straps softer than you've ever felt
  • Seamless under tees
  • Size Breakdown...
  • 0 fits bra sizes: 30A, 30B, 30C, 32A
  • 1 fits bra sizes: 30D, 32B, 32C, 34A, 34B
  • 2 fits bra sizes: 30DD, 32D, 32DD, 34C, 34D, 36A
  • 3 fits bra sizes: 34DD, 36B, 36C, 36D, 38B
  • 4 fits bra sizes: 36DD, 38C, 38D, 38DD
  • Questions? Talk to us: hello@negativeunderwear.com
Orders over $100 ship for free. 
All unworn items, with tags attached and in their original packaging are eligible for return or direct exchange within 21 days of placing your order.

Want to know our full returns policies? Here you go.

Want more info about shipping, materials or care instructions? Here!

Anything else? Email us at hello@negativeunderwear.com

    $55
    That bra you tell all your friends about and don't want to take off? Yup, this is that bra. 
    • Now back in stock(!!!)
    • We've updated our fit - double check size chart
    • Subtly sheer Belgian honeycomb micromesh
    • More shaping and support than you'd expect from a wireless
    • Heat transferred care label = no itchy tags
    • Silky no-slip straps softer than you've ever felt
    • Seamless under tees
    • Size Breakdown...
    • 0 fits bra sizes: 30A, 30B, 30C, 32A
    • 1 fits bra sizes: 30D, 32B, 32C, 34A, 34B
    • 2 fits bra sizes: 30DD, 32D, 32DD, 34C, 34D, 36A
    • 3 fits bra sizes: 34DD, 36B, 36C, 36D, 38B
    • 4 fits bra sizes: 36DD, 38C, 38D, 38DD
    • Questions? Talk to us: hello@negativeunderwear.com
    Orders over $100 ship for free. 
    All unworn items, with tags attached and in their original packaging are eligible for return or direct exchange within 21 days of placing your order.

    Want to know our full returns policies? Here you go.

    Want more info about shipping, materials or care instructions? Here!

    Anything else? Email us at hello@negativeunderwear.com

      Pair it with ->

      MK, shown here, is a size 26 jean, wearing a size 1 Sieve Brief in Slate
      Sieve Brief in Slate $35
      Sieve Thong in Slate Our signature plush elastic waistband sits flat, never digs or rolls
      Sieve Thong in Slate $28
      Rated 5.0 out of 5
      3 Reviews
      Write a Review
      average rating 4.9 out of 5
      Based on 9 reviews
      • 5 Stars
        8 Reviews
      • 4 Stars
        1 Review
      • 3 Stars
        0 Reviews
      • 2 Stars
        0 Reviews
      • 1 Star
        0 Reviews
      100% 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
      9 Reviews
      Rated 5 out of 5
      Review posted

      Wow.

      I was really taken aback by how comfortable this bra is. I was incredibly skeptical of trying a mesh material (I've tried some scratchy ones in the past), but this is so different. It feels so smooth on the skin and offers support without being overly tight or constricting. I do have smaller boobs (32C), so take this with a grain of salt, but for me, this bra fits perfectly. I haven't had it for very long, so I'm hoping it stands the test of time. If it does, I'm going to make it a staple.

      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?
      Rated 4 out of 5
      Review posted

      Very comfortable & functional bra, but I don't know what to do about sweat stains..?!

      I love this bra, very comfortable and the size is perfect for me. The only thing I'm left not knowing what to do with is the apparent sweat stains that were left after one use (yes, I was dancing). The nature of this bra makes this super obvious and therefore slightly embarrassing if I were ever to show it to anyone else. It just seems that this would be a common issue for other folks and I'm curious how to avoid/amend the problem. :(

      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 4 out of 5
      Was this helpful?
      Rated 5 out of 5
      Review posted

      LOVE

      Absolutely love this bra. I will be buying another one in a different color asap!!!

      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?
      Rated 5 out of 5
      Review posted

      Most comfortable undergarments ever!

      I absolutely love my Negative bra and panties. Most comfortable fabric and fit ever! Very figure flattering.

      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?
      Rated 5 out of 5
      Review posted

      Absolutely Adore This Bra

      This is a totally real review. I was swept in by a facebook ad (??!!) and I freaking love this bra. I'm not into underwire or padding, but wanted something fancier than my cotton bralettes. This bra is absolutely perfect. I got it in 3 colors.

      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?

      @negativeunderwear

      Book an Appointment







      Size Guide

      What size am I in Negative?

      If you already wear a certain bra size most often, you'll probably be the same in Negative - or at least that's the best place to start.

      Need More Help?

      If you've got specific questions, our awesome customer service team would love to help. No question is too small or TMI (trust us, we've heard it all) - hit us up: hello@negativeunderwear.com

      How do I find out what size I am in Bras?

      If you don't like the fit of your current bras, pull out a tape measure and let's figure out what size you are in 4 easy steps

      Step 1: Bra and Tape

      Wear your best-fitting, unpadded, underwire bra and nothing else. Grab a soft tape measure that is in inches.

      Step 2: Band Measurement

      Wrap a tape measure around your ribcage, following the base of your bra band - pull taut so there's no dip in the tape, but not so tight that you create an indent. This number, in inches, is your band measurement. If the number is odd, round up to the nearest even.

      Step 3: Bust Measurement

      Move the tape around the fullest part of your bust, typically at the center of your nips, wrap evenly around your back, holding taut without any dipping. Take this measurement in inches, this is your bust measurement.

      Step 4: Bra Size

      Take your bust measurement (second one) and subtract your band measurement (first one). Each inch difference between your band and bust measurements equals one cup size. The band measurement and cup size combined are your underwire bra size.

      An Example