UltraThin No-Show high-waist period panty Absorption: moderate product image (primary)
Front-facing high-waist brief laid flat showing full front panel and leg openings; white stretch fabric printed with a small purple floral and brown-stem pattern; visible black inner gusset panels with repeating white wording.

Knix

Ultrathin No-Show High-Waist Period Panty Absorption: Moderate

4.5/5 (2)
CA$32.00CAD
In Stock

Knix UltraThin No-Show High-Waist Period Panty is a moderate-absorbency (equivalent to 2.5 regular tampons) leakproof brief made from silky stretch nylon-blend microfibre with a patented 360 LeakSeal gusset trim, designed for periods, urine leakage, and sweat. It features a high-waist bikini cut, stretch waistband, and seamless construction for a discreet fit under clothing. User reviews note it is praised for its thin, no-show comfort on light to moderate flow days, though some report limited coverage and absorbency for heavier flow, along with potential fabric loosening over time.

Material
Silky, stretch nylon-blend microfibre
Gender
female
Style
minimal, athleisure
Category
Apparel & Accessories > Clothing > Underwear & Socks > Underwear

Color

BlackIvory/Cream BeigePatterned WhiteBaby Blue

Size

X-SMALLSMALLMEDIUMLARGEX-LARGE

Specifications

Silky, high-waist period panty with moderate absorbency and seamless construction for discreet everyday wear.

Patented 360 LeakSeal gusset trim, liquid-resistant fabric, seamless construction, stretch waistband

Material
Silky, stretch nylon-blend microfibre
Style
minimal, athleisure
Occasion
everyday, loungewear
Gender
female
Age Group
adult
Condition
new
Category
Apparel & Accessories > Clothing > Underwear & Socks > Underwear

Additional Attributes

  • Silky, stretch nylon-blend microfibre
  • Patented 360 LeakSeal gusset trim for leak protection
  • Moderate absorption (equivalent to 2.5 regular tampons)
  • Suitable for periods, urine leakage, and sweat
  • Liquid-resistant fabric for spill prevention
  • High-waist bikini cut
  • Stretch waistband
  • Strategic seamless construction for discreet look under clothes
  • Ultrathin no-show design

Product Insights

The Knix Ultrathin No-Show High-Waist Period Panty (Moderate absorption, $32 CAD) is a seamless, discreet option that looks and feels like regular underwear, with a 360 LeakSeal and perimeter seal to contain periods, urine, and sweat without edge-wicking or panty lines, even under tight clothing. However, its thin design limits absorbent area and gusset length, leading to leaks on moderate to heavy flow, and the high-waist fit—while comfortable initially—has a rough gusset that loosens over time, with noticeable odor after several hours and higher price than rivals.

Verified claims

Leak protection
Small gusset causes leaks on heavy flow despite handling periods, urine, and sweat.
No-show
Buyers confirm no panty line under tight pants; thinner than Victoria's Secret.
Comfort
High-waist design comfortable for heavy flow, but gusset rough initially and loosens over time.
Competitive trade-offs
Knix is thinner and more discreet than major rivals, with moderate absorbency and a higher price.
Odor
Odor is noticeably stronger than cotton cloth pads and becomes noticeable after several hours of wear.
Coverage
Gusset too short front-to-back; buyers report leaks on moderate flow days.
Fit longevity
Elasticity degrades over time; buyers report looser fit and increased leak risk.
Thinness tradeoff
Thin design limits absorbent area; buyers find it less reliable for heavy flow.
Fit variability
Coverage satisfaction varies by body shape and sleep position, per buyers.
Lifespan
With proper care, the panty lasts about two years before elastic loosening and absorbency decline.
Multi-fluid
Rated for periods, bladder leaks, and sweat; founder endorses for workouts.
Leak seal
360 LeakSeal prevents edge-wicking for all fluid types.
Discretion
Seamless, thin gusset looks and feels like regular underwear.
Perimeter seal
Patented perimeter seal prevents edge-wicking, containing leaks from all angles including when moving or lying down.
Use cases
The seal contains periods, urine leaks, and sweat, as claimed by the brand and confirmed by user reviews.

Product record

Title
Ultrathin No-Show High-Waist Period Panty Absorption: Moderate
Brand
Knix
Price
32 CAD
Availability
In stock

Image Analysis

3 images
UltraThin No-Show high-waist period panty Absorption: moderate product image (primary)
01

Product

Front-facing high-waist brief laid flat showing full front panel and leg openings; white stretch fabric printed with a small purple floral and brown-stem pattern; visible black inner gusset panels with repeating white wording.

  • SilhouetteHigh-rise brief shown flat from the front with a wide waist band area and full coverage front panel leading to two curved leg openings.
    1 regionx 0.08 · y 0.06 · w 0.84 · h 0.88 (high)
  • Fabric surface and finishSmooth, slightly glossy stretch knit fabric with no visible texture or heavy weave; fabric lies flat without visible seams on the front panel except at the leg openings.
    1 regionx 0.12 · y 0.12 · w 0.76 · h 0.70 (high)
  • Print patternScattered small floral print consisting of lavender-purple flower clusters and brown thin stems and leaves repeated across the entire visible product surface.
    3 regionsx 0.18 · y 0.14 · w 0.22 · h 0.18 (high); x 0.52 · y 0.28 · w 0.24 · h 0.20 (high); x 0.36 · y 0.62 · w 0.28 · h 0.26 (high)
  • Leg opening finishLeg openings cut in a smooth curved shape with minimal visible topstitching; inner edges roll slightly inward showing the same printed fabric on the inside.
    2 regionsx 0.06 · y 0.56 · w 0.36 · h 0.32 (high); x 0.58 · y 0.56 · w 0.36 · h 0.32 (high)
  • Inner gusset panelsTwo black inner gusset panels visible inside each leg opening, each showing a repeated small white word or mark along the exposed edge.
    2 regionsx 0.16 · y 0.70 · w 0.14 · h 0.12 (high); x 0.70 · y 0.70 · w 0.14 · h 0.12 (high)
  • Interior gusset textknix knix knixPartial
    2 regionsx 0.16 · y 0.70 · w 0.14 · h 0.06 (medium); x 0.70 · y 0.70 · w 0.14 · h 0.06 (medium)

Other

Flat-lay product shot on a uniform light gray background with even diffuse lighting and minimal shadow; product centered in frame and cropped with small margin to image edges.

  • Background and stagingUniform pale gray background with the garment placed flat and centered; no props or packaging visible.
    1 regionx 0.00 · y 0.00 · w 1.00 · h 1.00 (high)
  • Shot compositionTop-down flat-lay composition showing the full front panel and leg openings; image cropped evenly on left and right with the waist band near the top edge.
  • Lighting and shadowsEven, diffuse lighting with very soft shadows beneath the lower edge of the garment and minimal specular highlights.

Colors

white· main bodylavender purple· floral printwarm brown· floral stems and leavesblack· inner gusset panels
UltraThin No-Show high-waist period panty Absorption: moderate product image 2
02

Product

Flat-lay rear view of a high-waist panty with an all-over small floral print on a light base; visible smooth fabric, sealed edges, and a slightly lighter inner gusset area near the bottom center.

  • View and orientationFlat top-down rear view of the panty laid flat, showing full back panel and leg openings; waistband at top, gusset toward bottom center.
    1 regionx 0.05 · y 0.03 · w 0.90 · h 0.94 (high)
  • Overall shapeHigh-waist silhouette with a wide rectangular top (waistband) narrowing to a V shape toward the crotch; leg openings create angled cut-ins on left and right lower sides.
    1 regionx 0.06 · y 0.02 · w 0.88 · h 0.96 (high)
  • Fabric surfaceSmooth, lightweight knit or stretch fabric with a matte finish and no visible texture or ribbing at this resolution.
    1 regionx 0.20 · y 0.15 · w 0.60 · h 0.70 (medium)
  • Edge constructionNarrow sealed edges around waistband and leg openings with no visible elastic band or topstitching.
    2 regionsx 0.08 · y 0.04 · w 0.84 · h 0.12 (medium); x 0.08 · y 0.78 · w 0.84 · h 0.18 (medium)
  • Gusset interiorSlightly lighter, pale pink panel is visible at the lower center inside the leg opening area, indicating the inner gusset layer.
    1 regionx 0.32 · y 0.74 · w 0.36 · h 0.18 (high)
  • Floral print - motif scaleAll-over small scattered floral sprigs repeated across the garment at close spacing; motifs are varied but consistently small.
    1 regionx 0.12 · y 0.12 · w 0.76 · h 0.72 (high)
  • Floral print detailEach motif consists of small purple/lilac petals, tiny blue berry or bud accents, and thin brown stems and leaves.
    2 regionsx 0.45 · y 0.30 · w 0.18 · h 0.18 (high); x 0.68 · y 0.56 · w 0.12 · h 0.16 (high)
  • Small printed text blockFaint small printed text or care label visible in the upper-center area on the fabric but illegible at this resolution.Partial
    1 regionx 0.42 · y 0.14 · w 0.16 · h 0.06 (medium)

Other

Studio-style flat-lay photograph on a light neutral background with soft even lighting and a faint shadow under the product; image is centered and cropped to show the full garment.

  • Background and stagingLight neutral backdrop with no props; panty placed centrally in frame.
  • Lighting and shadowSoft, even overhead lighting with a subtle soft shadow visible beneath the lower edge of the garment.
    1 regionx 0.28 · y 0.86 · w 0.44 · h 0.12 (medium)
  • Image framingProduct is fully visible with small margins on left and right; top and bottom edges are inside the frame.

Colors

pale off-white· base fabric#F1F1F5soft lilac· flower petalssteel blue· small budswarm brown· stems and leavespale pink· gusset interior#ECEBEC
UltraThin No-Show high-waist period panty Absorption: moderate product image 3
03

Product

A vertical strip of the underwear fabric is visible through a rectangular die-cut window on the right side of the package showing a white base with a purple and blue floral print and tan stems.

  • Visible fabric stripRectangular vertical fabric panel visible through package window showing white knit fabric with scattered floral print in purple and blue with tan stems and small greenish-brown leaves.
    1 regionx 0.74 · y 0.18 · w 0.14 · h 0.64 (high)
  • Fabric backgroundFabric base color appears solid white where not patterned.
    1 regionx 0.76 · y 0.22 · w 0.10 · h 0.56 (high)
  • Floral motif detailFloral elements include small clustered blossoms and individual petals in medium purple and periwinkle blue, with thin tan stems and small olive-green leaves.
    1 regionx 0.75 · y 0.26 · w 0.12 · h 0.50 (high)

Packaging

Matte black rectangular hanging box with a pale pink information panel on the left and a circular pale pink size badge at top right; a tall rectangular window exposes the product fabric.

  • Box color and finishLarge rectangular outer box with a predominantly matte black front surface and a built-in hanger tab centered at top.
    1 regionx 0.03 · y 0.00 · w 0.94 · h 0.99 (medium)
  • Hanger tabClear or translucent plastic hanger tab projecting from top center of the box.
    1 regionx 0.42 · y 0.00 · w 0.16 · h 0.12 (high)
  • Left information panelSquare pale pink to off-white rectangular panel affixed to the left center of the box containing brand name and product copy.
    1 regionx 0.10 · y 0.25 · w 0.40 · h 0.34 (high)
  • Size badgeCircular pale pink badge near the top right of the box with a small underwear icon and size text below it.
    1 regionx 0.75 · y 0.05 · w 0.16 · h 0.16 (high)
  • Brand wordmarkLarge serif wordmark printed on the left pale panel reading 'knix' in lowercase letters.
    1 regionx 0.12 · y 0.27 · w 0.34 · h 0.16 (high)
  • Product description text blockMultiple lines of small black copy on the pale panel including product descriptors and a small underwear outline icon near the bottom of the panel.
    1 regionx 0.12 · y 0.41 · w 0.34 · h 0.15 (high)
  • Small absorbency iconsThree small droplet icons and a short two-line caption indicating absorbency near the lower left of the pale panel.
    1 regionx 0.12 · y 0.52 · w 0.18 · h 0.08 (medium)
  • Legible text linesLeakproof UltraThin No-Show High Rise Underwear
    1 regionx 0.12 · y 0.40 · w 0.34 · h 0.08 (high)
  • French text linesCulotte taille haute tre`s mince invisible e´tanchePartial
    1 regionx 0.12 · y 0.45 · w 0.34 · h 0.06 (medium)
  • Size badge textS | P QTY | QTE : 1Partial
    1 regionx 0.78 · y 0.07 · w 0.12 · h 0.10 (medium)
  • Underwear icon on badgeSmall line-drawn underwear icon printed above the size badge text.
    1 regionx 0.78 · y 0.05 · w 0.12 · h 0.06 (high)

Other

Product shot is centered on a light gray neutral studio background with soft lighting and a faint shadow; image is cropped to show full front of the box.

  • BackgroundEven light gray studio background filling the frame.
  • Shadow and lightingSoft diffuse lighting with a subtle shadow along the lower-right edge of the package.
  • Shot framingRectilinear frontal product shot showing the package centered and fully visible within the image.

Colors

matte black· box frontPackaging#0E0E0Dpale blush pink· information panelPackagingpale blush pink· size badgePackagingbright white· base fabricmedium purple· floral purpleperiwinkle blue· floral bluetan and olive· stems and leaves

Customer Reviews

2 total
4.5

2 reviews · out of 5

Culotte taille haute

Yolaine G.

Confortable

Parfaite

Johanne S.

J’ai acheté la culotte menstruelle surtout pour la transpiration lors de l’entraînement physique, je l’adore.

Reddit Insights

5 threads · r/TheGirlSurvivalGuide, r/PeriodUnderwear

Reddit users are divided on Knix period underwear, with many praising its thin, no-show comfort for light to moderate days, but others criticizing insufficient absorbency, small coverage, and odor issues for heavier flow.

mixed sentiment90% match

Positive comments highlight comfort and thinness, but many users report leaks, poor coverage, and odor, resulting in a slightly negative overall sentiment.

Themes

Absorbency and Leak Protectionmixed
Comfort and No-Show Profilepositive
Design and Coveragenegative
Odornegative
Durabilitymixed

Use Cases

  • Primary protection on light to moderate flow days
  • Overnight protection
  • Backup to tampon or menstrual cup
  • No-show under tight clothing

Watch Out For

highMay leak after a few hours on moderate to heavy days due to small gusset and limited absorbency.
mediumFabric can loosen over time, leading to fit issues and potential leaks.
mediumLining coverage may not extend far enough in the front or back, causing leaks for back sleepers or certain body shapes.
lowSome users experience strong odor retention that is not typical with other reusable products.
mediumAbsorbency can degrade if not cared for properly (e.g., fabric softener, dryer).

Compared To

vs Victoria's Secret period underwear

Knix is thinner and less bulky, offering a true no-show fit compared to Victoria's Secret, which feels more like a pad.

vs Aisle period underwear

Aisle may offer better absorbency for heavy flow, but Knix is preferred for its thinner, no-show profile.

vs The Period Company

The Period Company offers more reliable absorbency at a lower price, but Knix is thinner and less bulky, making it more discreet.

Source Threads

  • User loves Knix for heavy days and bed, praises thinness and no-show

    My fave are my ones from Knix, I waited and got them when they were having a sale because they were the most expensive, but they are the best! I wear them on my heavy flow days and to bed. I don’t use tampons anymore, but I know some gals do both. They are so comfy and stretchy, and they are so thin they don’t give me a noticeable panty line if I’m wearing tight pants. Total game changer!

    u/pansy-assr/TheGirlSurvivalGuideView thread →

  • User compares Knix favorably to Victoria's Secret, highlighting thinness and no-show comfort

    I purchased Knix, a six pack for myself 2 years ago and a six pack for my friend for Christmas this year and we both really love them. I'll never go back. I also have some Victoria's secret. Panties but they are a lot thicker and bulkier than Knix. They aren't no show lining and they feel more like you're wearing a pad. I still like them but Knix has my heart

    u/Olivineyesr/TheGirlSurvivalGuideView thread →

  • Critical review citing small gusset, poor leak coverage, and short absorbency duration

    Knix absolutely sucks. Their gusset is too small, don’t have enough leak coverage, and the lining can feel rough the first couple wears. I have the dream shorts and briefs; despite the absorbency they advertise, none of them last more than a couple hours for me unless it’s the first day or last day of my period. Which is what I use them for now.

    u/[deleted]r/PeriodUnderwearView thread →

  • User loves Knix, uses sleep shorts for overnight, and couples with tampon for long shifts

    I love Knix, I wear the period panties, the regular panties, and the loungewear. I’ve owned all my period panties for 2 years now and they have all held up great. A bit looser now, but that’s both fabric/elastic stretching, and weight fluctuations.  I recommend the sleep shorts, they keep me clean for an entire night of heavy flow. I honestly wear them in the day too, they’re low profile enough I can wear them under proper pants, but not leggings.  If I’m working a long (10+ hour) shift at work I’ll couple a pair of heavy flow panties with a tampon, so if the tampon leaks before I can change it, I’m safe. I don’t love the feeling of working a long shift with soaked period panties, so this works for me great.

    u/ewwwwwwwdavidr/PeriodUnderwearView thread →

  • User agrees with review, notes surprisingly bad odor compared to cloth pads

    I have the leakproof cheeky and overall I agree w/ you. I was surprised at how bad the odor is bc when I use cloth pads it doesn’t smell that bad...

    u/sno98006r/PeriodUnderwearView thread →

Provenance

Merchant Link
https://www.simons.ca/en/women-underwear/panties/period-underwear/ultrathin-no-show-high-waist-period-panty-absorption-moderate--22786-2504?colourId=19
Updated