Your cart

International Shipping now available!

Free U.S. Shipping for the holidays; Free Gift Socks on orders over $200

[Ksenia XS]
[Ksenia XS]
[Ksenia XS]
  • Thumbnail image #1 of Sieve Thong in Navy [Ksenia XS]
  • Thumbnail image #2 of Sieve Thong in Navy [Ksenia XS]
  • Thumbnail image #3 of Sieve Thong in Navy [Ksenia XS]
Product photo #1 of Sieve Thong in Navy [Ksenia XS] Product photo #2 of Sieve Thong in Navy [Ksenia XS] Product photo #3 of Sieve Thong in Navy [Ksenia XS]

Sieve Thong

Rated 4.8 out of 5
Based on 302 reviews

Ultra low rise. Honeycomb micromesh.


Sieve fan? Meet your matching bottom and feel all sorts of pulled together.
NEW

Free shipping for the holidays. Easy returns.

Fit

  • Size Chart
  • Use this as a guide. If you prefer a looser fit, we recommend sizing up

Fabric + Care

  • Size Chart
  • Belgian power micromesh is subtly sheer
  • 74% Polyamide (Nylon) 26% Elastane (Spandex)
  • 100% Cotton gusset lining
  • Wash on delicates/cold, 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 Non-Wire Bra in Navy Sieve Non-Wire Bra in Navy Sieve Non-Wire Bra in Navy $65
Sieve Triangle Bra in Navy Sieve Triangle Bra in Navy Sieve Triangle Bra in Navy $65
Sieve High-Waist Brief in Navy Sieve High-Waist Brief in Navy Sieve High-Waist Brief in Navy $45
Only a few left!
Sieve Non-Wire Bra + Sieve Triangle Bra in Navy (2 Pack) Sieve Non-Wire Bra + Sieve Triangle Bra in Navy (2 Pack) Sieve Non-Wire Bra + Sieve Triangle Bra in Navy (2 Pack) $123
Write a Review
average rating 4.8 out of 5
Based on 302 reviews
  • 5 Stars
    262 Reviews
  • 4 Stars
    27 Reviews
  • 3 Stars
    4 Reviews
  • 2 Stars
    5 Reviews
  • 1 Star
    4 Reviews
95% of reviewers would recommend this product to a friend
Overall
Rated 1 on a scale of minus 2 to 2, where minus 2 is Hated it, 0 is Meh and 2 is Loved it
Quality
Rated 4 out of 5
Comfort
Rated 4 out of 5
302 Reviews
Reviewed by Monika H.
Verified Buyer
Review posted
Sieve Thong in Moon
Reviewing
Sieve Thong in Moon
I recommend this product
Rated 5 out of 5
Size Purchased
S
How it Fits
True to Size
Age
45 - 54
Jean Size
  • 26

Great quality, comfortable, and sexy in an understated way

I’ve been searching for years for the perfect every-day underwear that satisfies both my active lifestyle and aesthetic sensibilities. The quality is excellent, the fit perfect and flattering. I bought matching bras and feel comfortable and sexy every time I wear my Negative underwear.

Loading...
Overall
Rated 2 on a scale of minus 2 to 2, where minus 2 is Hated it, 0 is Meh and 2 is Loved it
Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Was this helpful?
Reviewed by Jason B.
Verified Buyer
Review posted
Sieve Thong in Slate
Reviewing
Sieve Thong in Slate
I recommend this product
Rated 5 out of 5
Size Purchased
M
How it Fits
True to Size
Age
35 - 44
Jean Size
  • 6

Bought for my Girlfriend & she loves them!

I bought the Sieve Non-wire bra & thong for my girlfriend and she absolutely loves them! She says the bra is surprisingly supportive

Loading...
Overall
Rated 2 on a scale of minus 2 to 2, where minus 2 is Hated it, 0 is Meh and 2 is Loved it
Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Was this helpful?
Reviewed by Pam N.
Verified Buyer
Review posted
Sieve Thong in Buff + White
Reviewing
Sieve Thong in Buff + White
I recommend this product
Rated 5 out of 5
Size Purchased
L
How it Fits
True to Size
Age
65+
Jean Size
  • 30

Perfect Fit

It fits perfectly and doesn’t ride up. fabric is soft

Loading...
Overall
Rated 2 on a scale of minus 2 to 2, where minus 2 is Hated it, 0 is Meh and 2 is Loved it
Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Was this helpful?

Underwear Sizing

Underwear Sizing Size Chart

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

@negativeunderwear