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Light Leakproof UltraThin No-Show Thong 3-Pack
ACOTAR™ x Knix
Light Leakproof UltraThin No-Show Thong 3-Pack
$68.00
USD
Coming Soon • Oct 15
Limited-edition ACOTAR™ x Knix collection
Absorbs about 2 regular tampons
Invisible under clothes
More absorbency without bulk
Machine washable
Size and Fit Guide
How to Measure
In order to select the correct sizing, we recommend you take the following measurements using a soft tape measure. If necessary, ask someone else to help.
Waist
Measure around the narrowest part of your torso, usually just above your belly button. Keep the tape snug and level, but not tight. The number where it meets is your waist measurement.
Hip
Stand with your feet together and measure around the fullest part of your hips and buttocks. Keep the tape level and snug, but not tight. The number where it meets is your hip measurement.
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Part of the limited-edition ACOTAR™ x Knix Collection
Comfort-First Fit
Thong silhouette sits lower on the hip with minimal bum coverage.
Worry-Free Protection
Our newest leakproof innovation provides more absorbency without the bulk. Patented 360 LeakSeal™ technology locks in leaks at every edge.
Moderate Absorbency
It absorbs about 2 regular tampons worth of liquid—great for regular flow days, light bladder leaks, and sweat.
No-Show Style
Buttery-soft and smooth fabric gives a seamless look and feel. Disappears under clothes, even leggings.
Easy to Wash
Machine washable, just like your regular underwear.
ACOTAR™ is a trademark of Fireheart Inc. ©2015-2026, Sarah J. Maas.
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How to Choose?
Essential
- • Days you don’t need leak protection. Everyday freshness and moisture wicking.
-
0 tsp
Heavy
- • Extra peace of mind. For the first days of your cycle, light bladder leaks, or a full night's sleep without a leak.
-
about 8-14 tsp
-
about 1.5-3 regular pads
-
about 4-7 super tampons
-
about 1.5-3 menstrual cups
Light
- • Daily freshness. For sweat, discharge, period spotting, or backup protection.
-
about 1-3 tsp
-
about 1-3 pantyliners
-
about 1-3 regular tampons
-
about 0.5 menstrual cups
Moderate
- • For mid-cycle flow, surprise cough or sneeze leaks, or a really sweaty spin class.
-
about 4-8 tsp
-
about 1-1.5 regular pads
-
about 2-4 super tampons
-
about 0.5-3 menstrual cups
Ultra
- • Ultimate peace of mind. For the heaviest period days, light bladder leaks, unexpected postpartum flow, or overnight protection.
-
about 15-20 tsp
-
about 1.5-2.5 super pads
-
about 7-11 super tampons
-
about 2-3 menstrual cups
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Recently Viewed
What our customers are saying
Generated by AI from 100 most recent customer reviews
Last updated 4 months ago
Customers say these leakproof thongs offer good protection and comfort for light days, gym wear, and everyday use. Many reviews mention significant sizing inconsistencies, with most recommending sizing up at least one size from usual underwear sizes. Common feedback includes concerns about stiff material and tight fit, particularly around the waistband and edges. While some find the fabric less stretchy than expected, others praise the seamless design and confidence it provides. Frequent comments address the protective gusset placement, with mixed experiences on coverage effectiveness. Reviews are divided on durability and comfort after washing.
74%would recommend these products
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Usual Pant Size
293 reviews
- Rated 5 out of 5 stars9 hours agoLeakproof No-show Thong
Great fit. LOVE the color.
DJDelsheta J.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 3 out of 5 stars18 hours agoSoft but Off Sizing
This is my second pair of Knix. I absolutely love the other pair (French cut) and purchased a size small. I bought these in the same size and they fit much smaller.
LFLauren F.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 stars2 weeks agoNice and Sleek
Love neutral colors and fits great.
KGKylleesha G.Verified BuyerReviewingPOS - Light Leakproof UltraThin No-Show Thong (Zskus) - Rated 4 out of 5 stars2 weeks agoRuns small
The fabric is very nice / buttery feeling - the size is on the smaller size - I am usually a medium and had to go to a large.
CFCatherine F.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 stars2 weeks agoComfy
No show comfy
CBCindy B.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 stars2 weeks agoNeutral colors
Love it and happy with the feel.
KGKylleesha G.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 1 out of 5 stars3 weeks agoBled through easily
I can’t believe how fast I bled through these. I do not think the tampon estimate is correct AT ALL. I bled through in three hours and I am beyond mortified.
RMRachel M.Verified ReviewerReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 stars3 weeks ago5 Stars
Packed nicely and arrived quick!
EEricaReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 stars1 month agoBest underwear!
I thought these fit a little smaller than the brief cut but after wearing them, they are my new favourites! Comfortable, invisible and great for light flow days!
HAheather A.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 stars1 month ago5 Stars
amazing product, fits exactly as expected
TTraceyReviewingLight Leakproof UltraThin No-Show Thong - Rated 1 out of 5 stars1 month agoWeird
I've been wearing Knix for years. They no longer make the cheeky style so I tried these. These are more for sleeping. Although they fit okay the but was too big and they are not made for someone without one, so they are saggy. They definitely changed the cotton and the elastic is not seamless or smooth. The lining is not connected on the sides, just the front and back. I asked and was told that is the new design. So that is disappointing because they didn't wash well. Very much a step down.
DDDIANNA D.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 4 out of 5 stars2 months agoGreat Fit, Wish They Were Tagless
I am mostly happy with my new Light Leakproof UltraThin No-Show Thongs; however, I am Autistic, and thus I am sensitive to certain stimuli. I only purchase tagless clothing because my skin is easily irritated (sensory) by tags and seams. I had been happy with my previous knix purchases because the underwear is tagless, so I was unhappy to find tags in the thong underwear. I understand there isn’t much fabric to print information on; however, I feel that including a card with the size and washing instructions in each package would be sufficient, rather than irritating tags in the underwear. I appreciate your consideration.
MMMichelle M.Verified BuyerReviewingPOS - Light Leakproof UltraThin No-Show Thong - Last Call
