
Spanx
Undie-Tectable Support Bikini Panty Nylon
This is a Spanx at Miiyu Undie-Tectable Support Bikini Panty made from ultra silky microfibre nylon. It features laser-cut, seamless construction with a 100% cotton gusset for comfort and a wide high-rise fold-over waistband. Designed for everyday light support, it provides smooth shaping and a discreet fit under clothing.
- Material
- Ultra silky microfibre, 100% cotton gusset
- Gender
- female
- Style
- casual, minimal, modern
- Category
- Apparel & Accessories > Clothing > Underwear & Socks > Shapewear
Color
Size
Specifications
Ultra silky microfibre bikini panty with seamless construction and light support for everyday shaping.
Laser-cut seamless edges, 100% cotton gusset, light slimming support
- Material
- Ultra silky microfibre, 100% cotton gusset
- Secondary
- cotton
- Style
- casual, minimal, modern
- Occasion
- everyday, loungewear
- Gender
- female
- Age Group
- adult
- Condition
- new
- Category
- Apparel & Accessories > Clothing > Underwear & Socks > Shapewear
Additional Attributes
- ultra silky microfibre fabric
- 100% cotton gusset for maximum comfort
- laser-cut edges for invisibility
- seamless construction
- designed to slim figure in strategic areas
- everyday light support
- invisible under clothing
Product Insights
Spanx Undie-Tectable Support Bikini Panty Nylon ($38, in stock) offers light tummy control through slimming panels, adjustable by size, and rear coverage that stays in place despite varying by body type. Its cotton gusset wicks moisture, prevents odor, and remains invisible under thin leggings or light-colored pants. As the lightest compression tier in Spanx's shaping line, it provides comfortable all-day smoothing without riding down, though laser-cut edges lose invisibility after 15–20 washes (extendable with delicate care). Sizing varies across batches, prompting some to size down, and the 77% nylon/23% elastane fabric feels rougher with edges curling over time. Fans repurchase for its reliable no-show effect and mild shaping, despite shifts in fabric and sizing.
Verified claims
- Tummy control
- Slimming panels provide light tummy control, adjustable by size.
- Rear coverage
- Buyers report it avoids cutting the buttocks and stays in place, with rear fit varying by body type.
- Compression via size
- Compression level can be adjusted by choosing a different size.
- Hygiene
- Cotton gusset helps prevent yeast infections and irritation.
- Moisture management
- Cotton gusset wicks moisture, prevents odor, and protects outer clothes from stains.
- Discreetness
- Cotton gusset is not visible under thin leggings or light-colored pants.
- Waistband
- Sizing down prevents waistband rolling during movement and prolonged sitting.
- Compression level
- Lightest compression level in Spanx's shaping tiers.
- Shaping variant
- Has light shaping panels; the Undie-Tectable Lace Bikini has none.
- Comfort
- Buyers report comfortable all-day wear with effective smoothing.
- No-show
- Buyers confirm it vanishes under thin leggings and dresses, though some see lines on fuller figures.
- Gusset vs body feel
- Cotton gusset is breathable; the synthetic body drives the polarizing feel.
- Edge lifespan
- Laser-cut edges stay invisible for 15–20 washes before curling.
- Edge care
- Washing in a delicates bag on cold and air-drying extends edge flatness to 6–12 months.
- Travel
- Hand washes and dries overnight.
- Fit
- Provides light tummy control without riding down.
- Sizing
- Sizing varies across batches; some buyers size down for better fit.
- Durability
- 77% nylon/23% elastane fabric feels rougher; edges curl after 20 washes.
- Overall loyalty & changes
- Fans repurchase for no-show and light compression; fabric and sizing have changed.
Product record
- Title
- Undie-Tectable Support Bikini Panty Nylon
- Brand
- Spanx
- Price
- 38 CAD
- Availability
- In stock
Image Analysis
2 images- 01

Product
Flat-lay front view of a black high-rise bikini panty with a wide smooth fold-over top panel, curved leg openings, and visible front gusset seam; fabric appears matte and stretch-knit.
- Overall shapeFlat-lay front-facing bikini panty with a high-rise wide top panel that extends across the waist and a contoured lower bikini section with curved leg openings.
1 region
x 0.05 · y 0.18 · w 0.90 · h 0.62 (high) - Waist/top panelWide smooth top panel that appears folded or doubled over, forming a continuous, unbroken band across the upper portion of the panty.
1 region
x 0.05 · y 0.18 · w 0.90 · h 0.25 (high) - Leg openingsSymmetrical curved leg openings with narrow, smooth edges and no visible elastic casing.
1 region
x 0.12 · y 0.45 · w 0.76 · h 0.35 (high) - Seam detailVisible stitched seam along the center front/gusset area and faint horizontal stitch lines where the top panel meets the lower section.
1 region
x 0.32 · y 0.56 · w 0.36 · h 0.18 (high) - Fabric appearanceUniform, smooth, matte stretch-knit fabric with slight surface texture visible in the lower right curved area as subtle light falloff and creasing.
1 region
x 0.55 · y 0.55 · w 0.28 · h 0.28 (high)
Other
Studio flat-lay product shot on a white background with even front lighting and slight soft shadowing beneath the panty; image is centered and uncropped.
- Shot compositionCentered flat-lay product photographed against a clean white background, showing the full front of the garment with even lighting.
- BackgroundSolid white background filling the frame.
- Lighting and shadowSoft, diffuse lighting with a faint shadow below the panty suggesting studio illumination from above.
1 region
x 0.10 · y 0.70 · w 0.80 · h 0.20 (medium) - Image qualityHigh-resolution image with clear edges and visible fabric texture; no visible text or tags on the product.
Colors
matte black· main fabric#0E0E0E- Overall shapeFlat-lay front-facing bikini panty with a high-rise wide top panel that extends across the waist and a contoured lower bikini section with curved leg openings.
- 02

Product
Flat-laid rear view of a black bikini-style panty with a wide high-rise waistband and a smooth single-piece back panel with a shallow curved seam line across the upper rear.
- Overall silhouetteFlat-laid rear-facing bikini panty with a wide straight waistband at the top and a rounded lower back panel forming the leg openings.
1 region
x 0.05 · y 0.15 · w 0.90 · h 0.75 (high) - WaistbandWide high-rise waistband that appears as a single smooth band without visible elastic or topstitching along its top edge.
1 region
x 0.06 · y 0.15 · w 0.88 · h 0.20 (high) - Back panel seamShallow, gently curved seam line runs horizontally across the upper portion of the back panel, creating a subtle arc shape.
1 region
x 0.12 · y 0.28 · w 0.76 · h 0.14 (high) - Fabric appearanceSmooth, uniform knit fabric with a matte finish and no visible texture pattern or lace; fabric lies flat with minimal wrinkling.
1 region
x 0.10 · y 0.30 · w 0.80 · h 0.60 (high) - Seam at leg openingNarrow stitched hem visible along the bottom rounded edge where the leg openings would be, appearing as a faint linear stitch.
1 region
x 0.10 · y 0.70 · w 0.80 · h 0.16 (medium)
Other
Studio flat-lay product shot on a plain white background with even lighting and minimal shadows; image is centered and evenly cropped around the garment.
- Background and compositionProduct is centered on a uniform white background with substantial white space above and around the garment.
1 region
x 0.00 · y 0.00 · w 1.00 · h 1.00 (high) - Lighting and shadowEven diffuse lighting with a faint soft shadow under the lower edge of the panty, indicating studio illumination from above.
1 region
x 0.05 · y 0.75 · w 0.90 · h 0.20 (medium) - Image cropGarment is fully visible within the frame with small margins on left and right and larger white space above.
Colors
matte black· main fabric#1D1D1D- Overall silhouetteFlat-laid rear-facing bikini panty with a wide straight waistband at the top and a rounded lower back panel forming the leg openings.
Documents & Data
Customer Reviews
33 total33 reviews · out of 5
The quality is worse than before
I have been wearing this brand for many years and now I am disappointed with the quality, the fabric has become rougher
Beau produit, il reste à
Beau produit, il reste à savoir s'il sera durable.
Parfait
Parfait
too much support
too much like a girdle,
Mieux qu avant
Mieux qu avant
Confort et maintien
Maintien. oui.
PARFAIT
PARFAIT
Super, comme presque tous les
Super, comme presque tous les produits Spanks que j'ai achetés.
Ce modèle n’est pas Undie-tectable.
Ce modèle n’est pas Undie-tectable.
Love this undergarment
Worth the price for a very comfortable light control with no muffin topping or lines
Culotte de maintien tout en
Culotte de maintien tout en étant légère
Bikini maintient
Trop grande
tres enchanté de ce produit
tres enchanté de ce produit
Bon maintien ventral, indétectable sous
Bon maintien ventral, indétectable sous les vêtements
Parfait!
Parfait!
Bizarre à la fesse
Le ventre a un bon maintient, mais ça m'arrive vraiment étrange à la fesse, assurément c'est visible. J'avais commandé small car il y a 2 ans j'ai acheté le medium et il est trop grand, mais soit ils ont changé leur modèle et leur charte de taille, soit ce modèle ne me couvient simplement pas en small.
Maintient sans étouffer
Ne coupe pas les fesses en 2 parce que cette partie s'ajuste parfaitement sans être apparente. Offre un bon maintien sans excès.
I have purchased in the
I have purchased in the store but had to order online as stores are closed.
Definitely tectable
Uncomfortable and unflattering but otherwise expensive
tres bon maintien
tres bon maintien
Perfect fit.
Perfect fit, doesn’t ride up.
Parfaite
Parfaite
Bikini dee maintien
Très confortable
Ne monte pas assez haut.
Ne monte pas assez haut.
La petite culotte parfaite
Un bon support et aucune couture
Maintien léger
Confortable mais malheureusement le haut de la culotte roule facilement.
trop haute et tissus roule
trop haute et tissus roule mauvais maintien
Les sous-vêtements les plus hallucinants
Les sous-vêtements les plus hallucinants au monde!
Bikini
Très confortable
Comfy
Like these - my favourite.
Iem
Idem
Fits nicely
Fits nicely
Comfortable
Surprisingly comfortable.