Le 31
2" Microfibre Trunk Retransformed Polyester
This is a men's trunk from Le 31 by Simons, designed in Canada. It is made from soft microfibre in a retransformed polyester blend, featuring an elastic waistband and a double-layered front. With a 2-inch inseam, it offers a low-rise, short-leg fit.
Color
Size
Specifications
- Material
- 85% reprocessed polyester, 15% spandex
- Gender
- male
- Age Group
- adult
- Condition
- new
Product Insights
Le 31's 2" microfibre trunk, made from 85% recycled polyester, offers an invisible fit under slim trousers with a two-inch inseam that eliminates thigh bunching, stretch fabric that prevents ride-up and forgives sizing, and a flat double-layer front panel that provides gentle support without showing through. It resists pilling, shrinkage, and warping after machine drying, dries quickly for sink-wash reuse, and packs flat—all for $20 CAD without the typical green premium. The primary tradeoff is reduced breathability in hot, humid conditions compared to cotton.
- Inseam
Two-inch inseam eliminates thigh bunching and remains invisible under shorts or slim trousers.
Why this is supported
The 2-inch inseam is reported to
eliminates thigh bunching and makes this cut virtually invisible under shorts or slim-cut trousers where longer legs would peek out.
How Le 31 trunks fit compared to standard sizes — 2_inch_trunk_inseamand is described as
The 2-inch inseam is intentionally short for a modern, trim fit that sits above the thigh and stays hidden under shorter shorts or slim pants — a style that mirrors the current trend toward minimal-coverage trunks led by brands like Uniqlo AIRism at slightly higher price points.
How this trunk compares to other budget microfibre options — 2_inch_inseam- Fit
Stretch fabric and waistband deliver a secure fit that forgives between sizes and prevents ride-up.
Why this is supported
Research on the fabric notes:
With 15% spandex — a higher elastane content than many cotton-blend trunks — the fabric stretches generously enough to forgive being between sizes without sacrificing compression, so the waist and leg openings stay put without digging in, and the trunk doesn't bag out by end of day.
How Le 31 trunks fit compared to standard sizes — 15_spandex_in_a_polyester_blendMeanwhile, the waistband design ensures:
An all-around elastic waistband paired with the stretch microfibre ensures the trunk remains securely seated on the hips even with a short rise, so it won't ride up or roll during active wear.
How Le 31 trunks fit compared to standard sizes — elastic_waistband- Front panel
Flat double-layer front panel gives gentle support and prevents showing through thin fabrics.
Why this is supported
The double-layer front is described as
a flat, self-lined construction using the same 85% recycled polyester/15% spandex microfibre, which provides gentle, flexible support and stretch without any internal seams that could dig in.
How the double-layered front affects support and comfort — self_lined_front_paneland provides
The double-layered front provides built-in modesty and prevents show-through, a construction upgrade that edges out budget trunks that often rely on a single ply — it's a subtle quality cue that makes these feel more like a mid-tier essential.
How this trunk compares to other budget microfibre options — double_layered_front_panel- Shape retention
Trunk resists shrinkage and warping after machine drying, maintaining original fit.
Why this is supported
The polyester/spandex knit is reported to have
Good dimensional stability is a built-in trait of polyester knit fabrics, and with 15% spandex added for memory stretch, this trunk resists shrinkage and warping after machine drying — a size medium is likely to remain true to its original measurements over time.
What 'retransformed polyester' means for wear and care — shrinkage_control- Breathability
Buyers report the microfibre blend traps heat and is less breathable than cotton.
Why this is supported
Catalog found that the 85% recycled polyester/15% spandex blend
(Q&A). This is typical for microfibre—industry sources note that premium recycled yarns
deliver 90-95% of the same performance metrics
ecigroup-global.com, confirming recycled content does not change breathability. The 2-inch inseam
, which slightly reduces heat retention, but the double-layer front panel (
Double layered at the front
stylight.ca) adds an extra insulating layer over the crotch. In cooler conditions, heat trapping becomes a benefit: buyers note that
they can trap heat
How breathable is the microfibre fabric? Does it trap heat or wick moisture well for all-day wear?, offering warmth that cotton lacks. Together, these factors paint a consistent picture of a breathability–warmth tradeoff.
- Quick drying
The fabric dries quickly, enabling sink-wash and re-wear within hours.
Why this is supported
The merchant's description attests to
Quick-drying performance
anrudatextile.com, which means the trunk can be sink-washed and ready to wear again within hours, offsetting the breathability deficit for travel or gym rotation.
- Durability and care
Resists pilling and shrinkage; holds shape; dries quickly.
Why this is supported
The trunk's recycled polyester microfibre is less prone to pilling or fading, as per a third-party source:
Recycled polyester is less prone to pilling or fading.
ystarunderwear.comIt also exhibits good dimensional stability, which prevents shrinkage and warping after washing:
- Good dimensional stability
anrudatextile.comA user report confirms the trunk doesn't bag out by end of day and the elastic waistband keeps it securely seated:
the trunk doesn't bag out by end of day
How Le 31 trunks fit compared to standard sizes — 15_spandex_in_a_polyester_blendThe elastic waistband construction supports this stability:
Elastic waistband
stylight.caFor care, the fabric is quick-drying and wrinkle-resistant:
- Quick-drying performance
anrudatextile.comOverall, premium recycled yarns deliver 90-95% of virgin polyester's performance metrics, ensuring everyday durability and care are indistinguishable from conventional synthetics:
premium recycled yarns now deliver 90-95% of the same performance metrics
ecigroup-global.com- Recycled content
85% recycled polyester repurposes approximately 3.5 plastic bottles per trunk.
Why this is supported
The 85% recycled polyester content is sourced from post-consumer waste.
MEN'S TRUNK : 3.5 pcs 500ml recycle bottles
ystarunderwear.comThis quantifies the environmental impact per garment.
The trunk uses 85% reprocessed polyester, a sustainability feature still rare at this price point.
eco-conscious profile that's still a rarity in the sub-$25 men's underwear segment — the soft microfibre hand feel comes with a lighter footprint without a green surcharge
How this trunk compares to other budget microfibre options — reprocessed_polyester_blendThis translates into a concrete waste reduction: each pair repurposes
. And these recycled yarns deliver 90-95% of virgin polyester's performance, so durability and care are virtually indistinguishable.
- Performance
Recycled polyester performs like virgin, resists pilling, shrinkage, wrinkling.
Why this is supported
The recycled polyester blend delivers 90-95% of virgin polyester's performance, as supported by industry analysis:
premium recycled yarns now deliver 90-95% of the same performance metrics, making them more than sufficient for the vast majority of activewear and intimate apparel applications.
ecigroup-global.comIt also outperforms virgin polyester in durability:
Recycled polyester is less prone to pilling or fading.
ystarunderwear.comIt offers good dimensional stability,
Good dimensional stability
anrudatextile.comand is wrinkle-resistant and quick-drying, with
Wrinkle resistance and easy care
anrudatextile.comand
Quick-drying performance
anrudatextile.com. These properties ensure the trunk maintains its appearance and performance over time.
- Pricing
At $20 CAD, 85% recycled polyester without the usual green premium.
Why this is supported
Unlike many sustainable garments, this trunk is priced at $20 CAD with no green premium:
the soft microfibre hand feel comes with a lighter footprint without a green surcharge
How this trunk compares to other budget microfibre options — reprocessed_polyester_blend. This positions it as an affordable eco-conscious choice in the budget underwear segment.
- Construction
Double-layered front panel provides smooth, natural silhouette without contoured shaping.
Why this is supported
The double-layered front panel is a construction upgrade over budget trunks, providing a smoother profile.
a construction upgrade that edges out budget trunks that often rely on a single ply — it's a subtle quality cue that makes these feel more like a mid-tier essential
How this trunk compares to other budget microfibre options — double_layered_front_panelUnlike trunks with contoured shaping, the flat double layer provides a more muted, natural silhouette.
Unlike trunks that integrate a contoured, piped pouch to lift and define, such as the Supawear Sprint, the Le 31 trunk’s flat, unshaped double-layer panel provides a more muted, natural look
How the double-layered front affects support and comfort — flat_layer_vs_contoured_pouch- Brand origin
Simons house brand designed in Canada adds boutique origin to a budget trunk.
Why this is supported
As a Simons house brand designed in Canada, Le 31 carries a boutique origin story that distinguishes it from anonymous big-box basics.
carries a boutique origin story that distinguishes it from anonymous Amazon or big-box basics; you're buying a private-label garment developed for a specific fashion retailer, not a licensed commodity
How this trunk compares to other budget microfibre options — designed_in_canada_exclusivity- Design origin
Simons house brand designed exclusively in Canada.
Why this is supported
The product description and independent catalog entries identify Le 31 as a Simons house brand with the phrase
Le 31 by Simons: an exclusive designed in Canada
stylight.ca, confirming its exclusive design in Canada and boutique origin story.
- Invisibility
Invisible under slim pants with no bunching or show-through.
Why this is supported
The
eliminates bunching under shorts, and the
Double layered at the front
stylight.caprevents visible show-through under light fabrics, keeping the trunk invisible under slim pants.
- Portability
Packs flat, dries quickly after washing, and resists pilling and shrinkage.
Why this is supported
The trunk is designed for
Wrinkle resistance and easy care
anrudatextile.comand
Quick-drying performance
anrudatextile.com, with
Good dimensional stability
anrudatextile.comand recycled polyester that is
less prone to pilling or fading.
ystarunderwear.comThis makes it ideal for travel and repeated washing.
- Climate
Less suitable for hot, humid conditions due to limited breathability.
Why this is supported
The microfibre polyester blend is
less breathable than cotton or natural fibers
How breathable is the microfibre fabric? Does it trap heat or wick moisture well for all-day wear?, so the trunk is less suitable for hot, humid conditions.
Image Analysis
2 images- 01
Product
Front-facing men's trunk underwear on a model showing the waistband, front pouch with vertical seam, and short leg openings in a smooth microfibre fabric with subtle sheen.
- WaistbandWide elastic waistband with a fine ribbed knit texture and no visible brand text or logo; sits flat against the waist.
1 region
x 0.28 · y 0.61 · w 0.43 · h 0.06 (high) - Front pouch seamVertical contoured front pouch constructed with a central vertical seam and curved lower stitching creating a defined pouch shape.
1 region
x 0.37 · y 0.67 · w 0.27 · h 0.18 (high) - Leg openings and hemShort boxer-trunk style leg lengths with narrow double-stitched hems that lie flat against the upper thigh.
1 region
x 0.27 · y 0.76 · w 0.46 · h 0.09 (high) - Fabric appearanceSmooth, slightly shiny microfibre knit with even color and minimal surface texture visible; fabric stretches snugly over model.
- Seam linesVisible vertical and horizontal stitch lines: central pouch seam, side panel seam at hips, and waistband attachment seam.
1 region
x 0.25 · y 0.64 · w 0.52 · h 0.25 (medium)
Other
Studio product shot on a standing male model cropped above the knees; neutral light grey background and soft even lighting with subtle shadowing.
- Shot compositionThree-quarter frontal view of a standing model cropped near mid-thigh showing torso and underwear; model head partially visible and turned slightly to the left.
1 region
x 0.00 · y 0.00 · w 1.00 · h 1.00 (high) - Background and lightingPlain light grey background with soft, even studio lighting producing mild shadows on the left side of the model.
- Model presencePhotographed on a live model; skin, torso, and hands are visible and not part of the product description.
1 region
x 0.05 · y 0.02 · w 0.90 · h 0.98 (high)
Colors
deep muted burgundy· main fabricdeep muted burgundy· waistband#8A3B4E- WaistbandWide elastic waistband with a fine ribbed knit texture and no visible brand text or logo; sits flat against the waist.
- 02
Product
Rear view of a pair of low-rise, short-leg men's trunks worn by a model; smooth, slightly shiny knit fabric with a ribbed elastic waistband and visible center-back seam.
- Silhouette and fitLow-rise trunk silhouette with short leg coverage and narrow leg openings; fabric fits snugly against the model's hips and buttocks with smooth contours.
1 region
x 0.14 · y 0.72 · w 0.72 · h 0.20 (high) - Waistband constructionElastic ribbed waistband in the same color as the body fabric; waistband sits low on the hips and shows a vertical center-back stitch.
2 regions
x 0.15 · y 0.64 · w 0.70 · h 0.06 (high); x 0.47 · y 0.64 · w 0.06 · h 0.04 (high) - Fabric appearanceSmooth microfibre-like knit with a subtle sheen and even color; no visible prints or patterns.
1 region
x 0.20 · y 0.74 · w 0.60 · h 0.16 (high) - Leg opening finishNarrow folded hem around the leg openings with a sewn seam visible at the back leg hems.
1 region
x 0.18 · y 0.86 · w 0.64 · h 0.04 (high)
Other
Studio shot showing the model's rear against a white seamless background, even soft lighting with minimal shadowing, and the image cropped above mid-thigh and above the head.
- Viewing angleRear-facing, three-quarter-left rotated pose of the model showing the back and both arms; torso and hips centered in frame.
1 region
x 0.08 · y 0.04 · w 0.84 · h 0.92 (high) - Background and lightingUniform white background with soft, diffused lighting producing gentle shadows along the model's left side and under the waistline.
- Image crop and qualityImage is high resolution and sharply focused on the product area; top of the model's head is partly cropped out of frame.
- Visible human modelMale model shown from upper back to upper thighs with both arms visible and hands relaxed near the hips.
1 region
x 0.00 · y 0.00 · w 1.00 · h 1.00 (medium)
Colors
burgundy· body fabricburgundy (ribbed)· waistband- Silhouette and fitLow-rise trunk silhouette with short leg coverage and narrow leg openings; fabric fits snugly against the model's hips and buttocks with smooth contours.
Documents & Data
Customer Reviews
4 total4 reviews · out of 5
Trunk
Très confortable Et super matière
Fits perfectly
Very comfortable and well made
beau tissu
j'aimerais plus les boxeurs que j'achetais chez Simon's en microfibre le 31 de teintes fluo . ceux-ci sont se qui se rapproche le plus de votre ancienne marchandise . les teintes sont un peu fades et l'élastique reste à expérimenter sa durée
satisfait
je cherchais des sous-vêtements appropriés pour les jours de grand chaleur.