Simons
Hydra plunge bra product image (primary)
Front view of a smooth molded plunge bra with underwire, thin adjustable straps, and a low center gore; shown on a model torso cropped at chin and hips.

Miiyu

Hydra Plunge Bra

4.5/5 (9)
CA$19.99CA$49.00-59%
In Stock

The Hydra Plunge Bra is a women's underwire bra with molded foam cups, constructed from a soft, stretch recycled nylon-blend microfibre (80% reprocessed nylon, 20% spandex). It offers moderate support with a low plunge center, thin multi-position adjustable straps, and a two-hook back closure, designed to be worn under T-shirts and low-cut necklines. Most reviewers report it fits true to size and is lightweight and comfortable, though at least one found it runs large.

Color

BlackWhite

Size

32-A34-A34-C34-D36-C38-C34-B38-A
View on merchant siteJSON

Specifications

Material
80% reprocessed nylon, 20% spandex
Gender
female
Age Group
adult
Condition
new

Product Insights

Miiyu's Hydra Plunge Bra offers a seamless, invisible look under thin tops with its low center gore, molded cups, and convertible thin straps, while its recycled nylon-spandex blend wicks moisture and dries quickly for breathability. However, the moderate support is best suited for A and B cups, and maintaining the shape requires cool hand-washing and a lingerie bag to prevent stretching or pilling.

Verified claims

Washing method
Hand-wash only; machine agitation damages wires and foam.
Water temperature
Wash in water below 30°C to preserve spandex elasticity.
Pilling prevention
Use a fine-mesh lingerie bag or wash solo to prevent pilling.
Softness
Soft, silky handfeel with reduced chafing on sensitive skin.
Care
Stretches up to 5-7x its length and snaps back, but requires cool hand wash to maintain shape.
Moisture management
Wicks sweat and dries quickly, with more air exchange than shapewear blends.
Seamless look
No visible lines under thin T-shirts thanks to smooth foam cups and microfibre finish.
Cup and gore
Low center gore and molded seamless cups eliminate lines under thin shirts.
Straps
Thin straps hide under sleeveless tops and convert to racerback.
Price reality
The $19.99 sale price is the effective market price, often as low as $9.99 on Lyst.
Value
The 80% recycled nylon, 20% spandex blend is competitively priced and as soft as virgin nylon.
Tradeoffs
Moderate support may not suit C/D cups; hand-washing is required for durability.
Cup support
Moderate support best for A and B cups; larger cups may lack lift.
Under-clothing invisibility
Seamless cups, plunge center gore, and racerback straps stay hidden under most tops.
Versatility
Straps can be reconfigured into a racerback and are thin enough to stay hidden under racerback and sleeveless tops.
Breathability & moisture
High recycled nylon content makes the bra breathable and moisture-wicking.

Product record

Title
Hydra Plunge Bra
Brand
Miiyu
Price
49 CAD
Availability
In stock
Rating
4.5 stars, 13 reviews, scale 5

Deep Research

Care that extends the life of the bra

  • The underwire channel, typically a fabric tunnel, wears thin with repeated bending and friction; hand washing eliminates the drum banging that causes micro-tears at the wire tips, and inspecting the channel before washing stops a small poke from becoming a full escape — once the wire breaks through, even a patch won't hold for more than a few wears, making prophylactic care the only real defense.
  • Twisting or wringing the Hydra Plunge after washing (against the label's 'wring out and lay flat' direction) can permanently crease the delicate polyurethane foam pads, creating a dent that shows through tight tops; instead, pressing water out between towels and gently reshaping the cups preserves the seamless silhouette that makes this bra a T-shirt staple.
  • The 20% spandex that gives the band and cups their recovery degrades rapidly in water above 30°C; hand washing in cool or lukewarm water keeps the elastane from permanently relaxing, which is critical for maintaining the moderate support and preventing the band from riding up after just a few wears — a warm wash effectively cuts the bra's lifespan in half.
  • The 80% reprocessed nylon microfibre, while soft, is susceptible to pilling and snagging when rubbed against rougher fabrics during washing; if machine washing is unavoidable, using a fine-mesh lingerie bag and washing separately from denim or towels preserves the smooth hand and prevents the telltale fuzz that prematurely ages a bra.
  • The Miiyu Hydra Plunge Bra's hand-wash-only instruction is non-negotiable for its underwire and delicate molded foam: machine agitation can bend the wire channel and permanently compress the foam cups — even a single delicate cycle risks creating visible dents that ruin the bra's smooth T-shirt look, while keeping the bra out of the drum prevents the most common failure where wires eventually poke through the casing.

How the sale price stacks up

  • The same Hydra Plunge Bra appears on Lyst for as low as $9.99 CAD in certain sizes, and $19.99 in others; the $49 MSRP is aspirational, meaning the sale price is better understood as the regular going rate than a 60%-off windfall.
  • At $19.99 CAD, the Hydra matches the regular price of Target's best-selling Auden plunge bra, which uses standard (non-recycled) microfiber — meaning the Hydra's recycled nylon-blend construction comes at no price premium over a basic, non-eco intimate.

Recycled nylon blend feel and breathability

  • The recycled nylon is spun as a microfibre — extremely fine filaments that create a silky, friction-free handfeel, reducing chafing and irritation against sensitive skin areas like the underband and straps.
  • The nylon microfibre dries significantly faster than cotton or plain spandex — moisture spreads across the surface and evaporates quickly, so the bra resists staying damp after light perspiration, a practical advantage for humid days or layering.
  • The 20% spandex, at the upper end of typical lingerie blends, gives the microfibre high elastic recovery — the bra stretches with movement but snaps back to maintain a smooth, gap-free fit over a full day's wear without bagging out.
  • Simons’ shift to recycled nylon for this bra delivers the same soft, stretch comfort as its virgin-nylon predecessor — the fabric’s explicit softness confirms that the recycled fiber matches the handfeel expectation, so the wearer gets a lower-impact garment with zero sensory trade-off.
  • An 80/20 nylon-spandex blend shifts the breathability profile toward better air exchange — higher nylon content prioritizes moisture management and airflow over the squeeze of compression fabrics, making this bra more comfortable for all-day wear than typical shapewear blends.
  • With an 80% nylon composition, the fabric leans heavily into nylon’s moisture-wicking property — sweat is pulled from the skin to the fabric surface where it evaporates faster, keeping the wearer drier under T-shirts in warm weather.

Seamless look under t-shirts

  • A plunge silhouette inherently positions the center gore low on the sternum, so the bra vanishes beneath deep V-necklines and button-downs worn open.
  • The cups are formed from a single layer of moulded foam rather than sewn from multiple pieces, so there are no seam ridges that could show through thin, drapey fabrics like jersey or modal.
  • The 80% recycled nylon / 20% spandex microfibre body is characterized by a smooth, low-profile finish that resists dimpling or edge show through fine-gauge and lightweight knits.
  • The straps are thinner than those on most everyday bras, which reduces the chance of them peeking out from sleeveless tops, and the multi-position clips allow them to be reconfigured into a racerback layout for an invisible fit under crossover shoulders.

Image Analysis

5 images
Hydra plunge bra product image (primary)
01

Product

Front view of a smooth molded plunge bra with underwire, thin adjustable straps, and a low center gore; shown on a model torso cropped at chin and hips.

  • Cup shapeTwo smooth, molded contoured cups with a deep plunge shape forming a V at the center; cups are seamless on visible surfaces.
    1 regionx 0.18 · y 0.28 · w 0.64 · h 0.30 (high)
  • UnderwireUnderwire is visible as a rounded stitched seam running along the bottom edge of each cup and meeting at the center gore.
    1 regionx 0.20 · y 0.48 · w 0.60 · h 0.10 (high)
  • Center goreLow, narrow center gore with a small vertical seam where the two cups meet, creating the plunge V.
    1 regionx 0.45 · y 0.40 · w 0.10 · h 0.12 (high)
  • StrapsThin flat shoulder straps attach near the outer cup edges and run upward; strap hardware near the shoulder is not visible but straps appear adjustable where they meet the cup.
    2 regionsx 0.24 · y 0.18 · w 0.08 · h 0.22 (high); x 0.68 · y 0.18 · w 0.06 · h 0.22 (high)
  • BandSmooth band below the cups follows the body's curve and matches the cup material; band edge has a narrow stitched hem visible along the bottom.
    1 regionx 0.18 · y 0.52 · w 0.64 · h 0.12 (high)
  • Fabric finishMatte, uniform fabric with a smooth, slightly satiny appearance and no visible surface texture or lace.
    1 regionx 0.18 · y 0.28 · w 0.64 · h 0.36 (high)
  • Visible stitchingNarrow, tonal stitching visible along the underwire channel and band hem; seams are minimal and match fabric color.
    1 regionx 0.20 · y 0.46 · w 0.60 · h 0.16 (high)

Other

Studio portrait crop showing model torso against a light neutral background with soft even lighting and minimal shadows.

  • Model crop and poseImage shows a female model cropped at the chin and upper hips, facing forward with arms relaxed at sides, exposing the bra and upper torso.
    1 regionx 0.00 · y 0.00 · w 1.00 · h 1.00 (high)
  • BackgroundPlain off-white or very light neutral background with no visible props or patterns.
    1 regionx 0.00 · y 0.00 · w 1.00 · h 1.00 (high)
  • Lighting and shadowSoft, even studio lighting with mild diffuse shadows under the breasts and along the torso contours; no harsh highlights.
  • Image qualitySharp, high-resolution image with clear detail on fabric and skin; colors are natural and edges are well defined.

Colors

matte black· cups and band#151315matte black· straps#0E0D0D
Hydra plunge bra product image 2
02

Product

Front view of a black plunge-style underwire bra with smooth molded cups, thin adjustable straps, and a low center gore; matching black low-rise panty visible at the hips.

  • Cup shapeSmooth, molded full-coverage cups with a deep V plunge neckline and a continuous smooth outer surface (no visible seams or decorative stitching on cups).
    1 regionx 0.12 · y 0.22 · w 0.76 · h 0.28 (high)
  • Underwire and bandCurved underwire channel visible along the lower edge of each cup leading into a narrow, smooth underbust band.
    1 regionx 0.12 · y 0.44 · w 0.76 · h 0.10 (high)
  • Center goreLow, narrow center gore forming the deepest point of the plunge between the cups.
    1 regionx 0.44 · y 0.30 · w 0.12 · h 0.12 (high)
  • Strap styleThin, adjustable shoulder straps attaching at the cup outer edge and extending over the shoulder; straps appear uniform width and fabric-covered.
    2 regionsx 0.18 · y 0.07 · w 0.12 · h 0.20 (high); x 0.66 · y 0.07 · w 0.12 · h 0.20 (high)
  • Fabric finishMatte, smooth fabric with minimal specular highlights, suggesting a uniform knit or microfiber surface.
    1 regionx 0.12 · y 0.22 · w 0.76 · h 0.28 (high)
  • Matching panty visibleLow-rise matching black panty visible at the hips with narrow side coverage; only the top waistband and side panels are visible.
    1 regionx 0.36 · y 0.62 · w 0.28 · h 0.16 (high)

Other

Studio portrait of a model cropped at mid-thigh and above the mouth with a plain light background and soft, even lighting; small soft shadow at model edges.

  • Model framingPhotograph shows a female model from just above mid-thigh to slightly above the mouth; face is partially cropped so eyes are not visible.
    1 regionx 0.00 · y 0.00 · w 1.00 · h 1.00 (high)
  • Background and lightingNeutral, off-white background with soft, even studio lighting and minimal harsh shadows; slight shadowing at the model's sides.
  • Image cropTop of head and eyes cropped out of frame; torso centered and occupying most of the image width.

Colors

matte black· bra fabric#150C0Amatte black· panty fabric#141314
Hydra plunge bra product image 3
03

Product

Front view of a two-piece underwear set worn on a model: a black molded plunge bra with thin shoulder straps and a matching black low-rise panty with a narrow scalloped lace trim at the waist.

  • Bra cup shapeSmooth, molded, contoured cups with a deep center plunge and slight seam where cups meet at center gore.
    1 regionx 0.20 · y 0.12 · w 0.60 · h 0.28 (high)
  • Underwire and bandUnderband appears structured and slightly lifted from the body, indicating underwire support visible as subtle shaping beneath each cup.Partial
    1 regionx 0.20 · y 0.30 · w 0.60 · h 0.08 (medium)
  • Shoulder strapsThin, rounded shoulder straps in the same black color as the cups, attaching near the outer top edge of each cup and running up over the shoulders.
    2 regionsx 0.20 · y 0.08 · w 0.18 · h 0.18 (high); x 0.62 · y 0.08 · w 0.18 · h 0.18 (high)
  • Bra material finishFabric on the bra cups appears smooth and matte with no visible texture or pattern.
    1 regionx 0.22 · y 0.14 · w 0.56 · h 0.24 (high)
  • Panty cutLow-rise panty with a V-shaped front and moderate coverage sides, sitting below the natural waistline.
    1 regionx 0.25 · y 0.45 · w 0.50 · h 0.25 (high)
  • Panty waistband detailNarrow waistband with a small scalloped lace trim along the top edge of the front panel.
    1 regionx 0.30 · y 0.45 · w 0.40 · h 0.06 (high)
  • Panty materialPanty fabric matches the bra: smooth, solid black with a matte finish and no visible pattern.
    1 regionx 0.30 · y 0.50 · w 0.40 · h 0.18 (high)
  • Visible seams and edgesClean finished edges and minimal visible topstitching around cup rims and panty leg openings.
    1 regionx 0.20 · y 0.12 · w 0.60 · h 0.60 (medium)

Other

Studio frontal shot of a model cropped at mid-thigh and above the head, neutral pale background, soft even lighting with minimal shadows.

  • Model and cropPhotographed on a female model from above the knees to just above the head; face partially visible but torso is the primary focus.
    1 regionx 0.05 · y 0.00 · w 0.90 · h 0.98 (high)
  • Background and lightingPlain off-white background with soft, diffuse studio lighting producing even illumination and gentle shadows along the model's contours.
  • PoseModel stands with one hand resting on the hip and the other arm relaxed at the side, slightly turned torso.
    1 regionx 0.55 · y 0.38 · w 0.38 · h 0.45 (high)
  • Image qualitySharp focus on the garment area, neutral color rendering, no visible packaging or hang tags.

Colors

black· bra cups and band#151414black· bra straps#150C0Ablack· panty front and waistband#151315
Hydra plunge bra product image 4
04

Product

Rear view of a black plunge bra on a model showing the back band, adjustable shoulder straps, hook-and-eye closure, and matching low-rise panties with lace trim.

  • Back bandStraight horizontal elastic back band in black fabric wrapping across the model's back, smooth matte appearance with a seam at the center where the closure attaches.
    1 regionx 0.16 · y 0.22 · w 0.68 · h 0.11 (high)
  • ClosureRectangular hook-and-eye closure panel at the center back where the band fastens, visibly darker due to layering and stitching.
    1 regionx 0.43 · y 0.26 · w 0.14 · h 0.07 (high)
  • Shoulder strapsTwo slim adjustable shoulder straps in black, each with a small rectangular metal or plastic slider for length adjustment; straps attach to the band near the outer back.
    2 regionsx 0.07 · y 0.04 · w 0.18 · h 0.36 (high); x 0.75 · y 0.05 · w 0.13 · h 0.34 (high)
  • Bra fabric and finishSmooth, solid black fabric with a matte finish and minimal visible texture; edges finished with narrow stitched hems.
  • Matching pantiesLow-rise black panties visible from the back, smooth fabric body with a narrow scalloped lace trim along the top waistband.
    1 regionx 0.18 · y 0.48 · w 0.64 · h 0.32 (high)
  • Lace trim detailDelicate scalloped black lace trim runs along the top edge of the panties waistband, forming a decorative thin band.
    1 regionx 0.25 · y 0.48 · w 0.50 · h 0.05 (high)

Other

Studio shot of a model shown from the rear against a plain light background with even soft lighting and minimal shadows; image is cropped from head to upper thighs.

  • Shot compositionRear-facing model centered in frame, crop includes shoulders down to upper thighs, background is uniform light/off-white.
  • Model hairDark curly hair visible at the top of the frame falling to the upper back.
    1 regionx 0.18 · y 0.00 · w 0.64 · h 0.18 (high)
  • Lighting and shadowSoft, even studio lighting producing gentle shadows under the arms and around the spine, no harsh highlights.
  • Image qualitySharp, high-resolution image with clear fabric texture and visible seam lines.

Colors

black· bra main fabric#150D0Ablack· panties body#141314black lace· panties lace trim
Hydra plunge bra product image 5
05

Product

Black plunge bra worn by a model showing molded underwire cups, a low center gore, thin adjustable straps, and a smooth matte finish; matching black low-rise brief is partially visible.

  • Molded cupsTwo smooth, contoured molded cups with seamless outer surfaces and a slight vertical curvature toward the center gore.
    1 regionx 0.18 · y 0.18 · w 0.64 · h 0.28 (high)
  • Underwire and bandUnderwire visible as a curved seam line running beneath each cup sitting on an elasticized underband that wraps under the bust.
    1 regionx 0.16 · y 0.36 · w 0.68 · h 0.12 (high)
  • Low center gore (plunge)Center gore is low and V-shaped, creating a deep plunge between the cups.
    1 regionx 0.42 · y 0.26 · w 0.16 · h 0.12 (high)
  • StrapsTwo narrow, flat shoulder straps in the same color as the cups; straps attach near the top outer edge of each cup and run over the shoulders.
    2 regionsx 0.12 · y 0.06 · w 0.12 · h 0.20 (high); x 0.76 · y 0.06 · w 0.12 · h 0.20 (high)
  • Fabric finishFabric appears smooth and matte with no visible lace or textured pattern.
    1 regionx 0.18 · y 0.18 · w 0.64 · h 0.28 (high)
  • Matching brief visibleA matching black low-rise brief is partially visible at the lower frame, showing narrow side coverage.
    1 regionx 0.36 · y 0.62 · w 0.28 · h 0.18 (high)

Other

Studio portrait of a model cropped at the chin and upper thighs against a neutral light background with soft, even lighting and minimal shadows.

  • Shot compositionFrontal studio portrait cropped at the model's chin and upper thighs, centering the torso and bra.
    1 regionx 0.00 · y 0.00 · w 1.00 · h 1.00 (medium)
  • Background and lightingNeutral off-white background with soft, diffuse lighting that produces gentle shadows along the body's contours.
  • Model presenceFemale model torso and arms are visible; face is partially shown (mouth and lower nose) but eyes and forehead are cropped out.
    1 regionx 0.20 · y 0.00 · w 0.60 · h 0.30 (high)

Colors

black· bra fabric#151414black· brief fabric#141314

Documents & Data

Customer Reviews

9 total
4.5

9 reviews · out of 5

Nice bra

★★★★★Jacqueline F.

Comfortable fit. Material soft

Soutien-gorge

★★★★★Isabelle G.

Très bien

Fait grand

★★★★★Tania B.

Je l'ai retourné

Parfait

★★★★★Julie P.

Simple, élégant et confortable.

Great comfortable bra, but the pricing needs review

★★★★★Priyaben P.

As a loyal customer of the Miiyu collection, I absolutely love the style of this bra. Because it is unpadded, it is incredibly comfortable and helps me sweat much less during the summer, which is exactly why I choose it for the warmer months. Simons also offers a great variety of colors—I purchased the plum/eggplant shade, and it is simply beautiful. Another handy feature is that the straps can be converted into an X-back design, which works perfectly to keep them from sliding down. However, I feel the original pricing needs to be reviewed by the Simons team. I was surprised when the price increased from $39 to $49 after Black Friday 2025. For a bra with no padded support, $49 feels far too high. I tracked the pricing for a while, seeing it drop to around $29. 95 in mid-May before finally purchasing it on sale for $19. 99 (which felt much more appropriate, though it dropped even further just five days later). Overall, the item itself is awesome and highly recommended for comfort, but the standard $49 price point doesn't seem suitable for an unpadded style.

Soutien gorge légèrement rembourré

★★★★★Guylaine C.

Belle variété de couleurs et culotte assortie

Very comfortable

★★★★★Brennah H.

This is the first underwire bra I don’t want to take off as soon as I get home.

Je l’adore!

★★★★★Nancy T.

Il fait vraiment bien et la couleur est magnifique!

Fait bien

★★★★★Michelle M.

Fait bien

Q&A

2 answered
Can the multi-position straps be configured into a racerback or crisscross style?
Yes, the multi-position straps can typically be configured into a racerback style by unclipping and re-clipping them at the center, though the product description does not explicitly confirm crisscross options.
How does the moderate support hold up for C and D cup sizes during daily wear?
The bra offers moderate support, which is generally suitable for smaller cup sizes like A and B. For C and D cup sizes, moderate support may not provide enough lift and stability for daily wear, but this is not explicitly stated in the product data.

Provenance

Merchant Link
https://www.simons.ca/en/women-underwear/bras/plunge/hydra-plunge-bra--15903-225839?colourId=22
Updated