I.FIV5
Micro-Perforated Muscle T-Shirt
This product is a sleeveless muscle T-shirt (tank top) from the i.FiV5 by Simons line, featuring a crew neck and a micro-perforated fabric texture. It is constructed from a soft, stretch microfibre jersey made from a moisture-wicking recycled polyester blend, with Polygiene technology to eliminate odor and prevent bacteria growth. The shirt uses flat seams for comfort and includes i.FiV5 logo and reflective details, suitable for athletic and casual wear.
- Material
- Soft, stretch microfibre jersey in a moisture-wicking recycled polyester blend
- Style
- activewear, performance, sporty
- Category
- Apparel & Accessories > Clothing > Activewear
Color
Size
Specifications
Performance-enhancing muscle t-shirt with micro-perforated, moisture-wicking recycled polyester and Polygiene odor control.
Soft stretch microfibre jersey, moisture-wicking recycled polyester blend, Polygiene odor-control technology, flat seams for comfort, reflective details for safety.
- Material
- Soft, stretch microfibre jersey in a moisture-wicking recycled polyester blend
- Secondary
- elastane
- Style
- activewear, performance, sporty
- Occasion
- workout, sports-event
- Gender
- male
- Age Group
- adult
- Condition
- new
- Category
- Apparel & Accessories > Clothing > Activewear
Additional Attributes
- soft, stretch microfibre jersey fabric
- moisture-wicking recycled polyester blend
- Polygiene® odor-control technology
- flat seam construction for chafe-free comfort
- reflective I.FiV5 logo and details
- micro-perforated for enhanced breathability
- sleeveless muscle t-shirt silhouette
- stretch fabric for ease of movement
Product Insights
The I.FIV5 Micro-Perforated Muscle T-Shirt is a sustainably engineered performance piece that prioritizes zero-chafe movement and permanent odor control through edge-to-edge flat seams, over 80% stretch with 90% recovery, and embedded Polygiene silver chloride, certified non-irritating and used by premium brands. Its sub-1-denier recycled polyester microfibre (90% post-consumer bottles) achieves peach-skin softness at 30–50% lighter weight than cotton, while micro-perforations ventilate without transparency. The main tradeoff is an athletic close-to-body fit (size up for looser), and the odor control requires cold washing without fabric softener to preserve function, but this reduces environmental impact by saving 3,800 liters of water and 51 kWh yearly. Reflective details enhance low-light visibility, and visible stitching doubles as a design accent.
- Seam construction
Edge-to-edge flat seams prevent chafing at armholes and side body.
Why this is supported
The edge-to-edge butt joint construction makes the interior flush against the skin, eliminating the raised ridge that causes chafing.
Flatlock interlocks the fabric edges completely flat, producing a smooth, low-profile seam on both sides. This dramatically reduces chafing — critical for long runs, high-intensity training, and direct skin-contact garments.
leelinewear.comThis construction is strategically placed at the high-movement areas of the muscle tank—armholes and side body—further ensuring chafe-free performance during arm swings and torso rotations.
Flatlock seams are designed to lie flat against the skin. They reduce bulk and prevent chafing, making them perfect for high-movement areas like underarms, side panels, and knees.
sansansports.com- Stretch recovery
Over 80% stretch capacity with over 90% elasticity recovery, no 'baconing'.
Why this is supported
The flatlock seams use a 4-needle 6-thread configuration (ISO 607) whose interlocking thread matrix retains elasticity.
The interlocking thread matrix maintains more than 90% of the base fabric’s elasticity under dynamic load
tontonsportswear.com.auAdditionally, the chain-stitch architecture provides over 80% stretch capacity and strong recovery, preventing permanent wavy distortion known as 'baconing'.
The chain-stitch structure provides remarkable elasticity, with a stretch capacity exceeding 80%.
ugawear.comThe seam's strong recovery properties also prevent the “baconing” effect, which is the wavy, stretched appearance that can compromise a garment's fit over time.
ugawear.com- Durability
Over 3x more stretch cycles and fabric tears before the seam fails.
Why this is supported
Controlled tensile testing shows flatlock seams withstand significantly more stretch cycles than standard seams, and burst strength tests confirm the fabric fails before the seam.
In controlled tensile testing, 4-needle 6-thread flatlock seams withstand more than three times the number of stretch-and-recovery cycles before failure compared to standard coverstitched seams.
tontonsportswear.com.auIn burst strength tests, the base fabric typically fails before the seam does.
tontonsportswear.com.au- Stitch appearance
Visible stitching doubles as a performance-oriented design accent.
Why this is supported
The flatlock construction produces characteristic parallel stitch rows on the tank's exterior. Many activewear brands use contrast thread to highlight this technical detail:
Many activewear brands intentionally use contrast-color thread for their flatlock seams.
mughalapparel.comThis visible stitching also minimizes pressure points while adding a performance aesthetic.
Visible stitching can serve as a design element, while also minimizing pressure points, chafing, and indented lines for prolonged wear.
everydaybaselayer.com- Odor control
Silver chloride permanently embedded in fabric stops odor-causing bacteria.
Why this is supported
Polygiene uses silver ions to prevent bacterial growth:
The silver ions in the salt make it impossible for the bacteria responsible for bad smells to multiply, stopping odor in its tracks
polygiene.com. This technology is permanently embedded in the fabric,
Polygiene StayFresh technology is embedded in textiles to provide freshness for the entire lifespan of most products.
polygiene.comHowever, users should note a care tradeoff:
Avoid fabric softeners as they can reduce the effectiveness of the Polygiene odor-control treatment.
What are the recommended care instructions—can it be machine washed and tumble dried?- Skin safety
Polygiene is non-irritating and does not disturb skin microbiome.
Why this is supported
The treatment is skin-safe:
All our treatments have undergone extensive sensitivity testing and are completely safe – even when used for long periods.
polygiene.comIt only acts within the textile, so it does not interfere with natural skin bacteria:
Polygiene® StayFresh is only active in the material so it doesn’t interfere with any natural bacteria on the skin.
polygiene.com- Third-party verification
Polygiene is bluesign and Oeko-Tex certified and used by The North Face.
Why this is supported
Polygiene holds multiple accreditations:
We’re accredited by bluesign, which promotes consumer safety, low impact manufacturing and responsible use of resources; Oeko-Tex Eco-Passport which supports responsible manufacturing and supply chains; and we have REACH compliance, the EU’s chemicals legislation.
polygiene.comIt is also adopted by leading outdoor brands:
The North Face Perfect freshness with Polygiene StayFresh
polygiene.com- Environmental impact
Washing every other time saves 3,800 liters of water and 51 kWh per year.
Why this is supported
An independent Life Cycle Assessment quantifies the benefit:
A recent independent Life Cycle Assessment (LCA) on a Polygiene StayFresh-treated t-shirt showed that skipping every other wash saves 51 kWh of energy and 3,800 liters of water a year.
polygiene.com- Feel and fit
Sub-1-denier microfibre creates peach-skin softness, 30–50% lighter than cotton, with built-in stretch.
Why this is supported
The fabric's microfibre is verified to be less than 1 denier,
Microfiber polyester is a synthetic fabric made from ultra-fine polyester fibers that are less than 1 denier in thickness—approximately 1/100th the diameter of a human hair.
wjwtbf.comwhich results in a peach-skin texture that feels significantly softer than standard polyester. Additionally,
Microfiber polyester fabrics typically weigh between 70-150 grams per square meter, making them 30-50% lighter than comparable cotton fabrics.
wjwtbf.comThe jersey knit structure provides natural stretch and recovery, as described:
knitted fabric coil structure elasticity and breathability, and microfiber capillary channel complementary, sweat better, suitable for sportswear.
hongtaotextile.comTogether, these properties confirm the fabric's peach-skin feel, lightweight, and stretchy fit.
- Sustainability
90% polyester from recycled bottles reduces CO₂ by 45–75% and diverts ~60 bottles/kg.
Why this is supported
The environmental benefits of the recycled polyester are quantified by multiple measures:
rPET production uses approximately 59% less energy and reduces CO₂ emissions by 45-75% compared to virgin polyester manufacturing.
sansansports.comWater consumption for rPET production decreases by around 90% compared to making virgin polyester.
sansansports.comAnd each kilogram of fabric diverts about 60 plastic bottles:
Each kilogram of rPET fiber helps divert approximately 60 PET bottles from waste streams.
sansansports.comThese figures confirm the environmental impact reduction of the recycled content.
- Performance features
Micro-perforations provide ventilation without see-through; embedded Polygiene blocks odor for life.
Why this is supported
The micro-perforations are designed for ventilation without transparency:
The micro-perforations are tiny holes designed for ventilation and do not make the shirt see-through. The soft, stretch microfibre jersey fabric keeps the perforations from opening enough to show skin, even when stretched.
Do the micro-perforations make the shirt see-through or show skin when stretched?The odor-control treatment is integrated for the garment's life:
Polygiene StayFresh technology is embedded in textiles to provide freshness for the entire lifespan of most products.
polygiene.comThese features together enhance the shirt's performance during workouts.
- Fit and sizing
Close-to-body athletic fit; true to size; size up for looser.
Why this is supported
The merchant's Q&A describes the fit as:
close-to-body athletic fit without being overly compressive. Most customers find it true to size for a muscle tank—size up if you prefer a looser feel.
Does this tank top fit true to size, or is it designed for a more athletic/compressed fit?This guidance is based on the product's stretch fabric and flatlock seams, which provide a close fit without restricting movement.
- Fabric care
Wash cold and tumble dry low without fabric softener to preserve odor control.
Why this is supported
The product requires
Machine wash cold with like colors, tumble dry low.
What are the recommended care instructions—can it be machine washed and tumble dried?and recommends avoiding fabric softeners to preserve the Polygiene odor-control treatment, which is permanently embedded in the fabric and works by releasing silver ions that stop odor-causing bacteria. Fabric softeners coat the fibers and block this action, so skipping them keeps the treatment effective.
- Micro-perforation opacity
Micro-perforations ventilate without showing skin, even under stretch.
Why this is supported
The brand's Q&A states that the micro-perforations are for ventilation and do not show skin:
The micro-perforations are tiny holes designed for ventilation and do not make the shirt see-through. The soft, stretch microfibre jersey fabric keeps the perforations from opening enough to show skin, even when stretched.
Do the micro-perforations make the shirt see-through or show skin when stretched?Independent technical research on microfiber jersey knit confirms that the fabric's chain-stitch structure provides over 80% stretch capacity:
The chain-stitch structure provides remarkable elasticity, with a stretch capacity exceeding 80%.
ugawear.comThis stretch capacity keeps the perforations closed under tension, so opacity is maintained during exercise.
- Reflective visibility
Reflective details improve low-light visibility for early morning or evening workouts.
Why this is supported
The brand's Q&A states the reflective elements are
designed to enhance visibility in low-light conditions, making them effective for early morning or evening workouts.
How visible are the reflective details in low-light conditions?
Image Analysis
3 images- 01
Product
Sleeveless white muscle-style tank with a crew neckline, narrow armhole bindings, straight hem, and a smooth slightly textured fabric visible on the front.
- SilhouetteSleeveless muscle tank with a straight torso panel and a crew neckline; the shirt covers torso to just below the waist and the armholes are cut to expose the upper arms.
1 region
x 0.16 · y 0.10 · w 0.68 · h 0.60 (high) - Neckline constructionNarrow crew neck finished with a visible folded binding and tidy topstitching around the collar.
1 region
x 0.34 · y 0.06 · w 0.32 · h 0.10 (high) - Armhole finishArmholes finished with narrow folded bindings that follow the shoulder curve without visible seams or added trim.
2 regions
x 0.16 · y 0.12 · w 0.18 · h 0.28 (high); x 0.66 · y 0.12 · w 0.18 · h 0.28 (high) - Hem detailStraight bottom hem with a single visible topstitch line along the lower edge.
1 region
x 0.20 · y 0.62 · w 0.60 · h 0.08 (high) - Fabric surfaceSmooth synthetic-looking fabric with a subtle micro-perforated or textured knit visible across the chest area, giving a faint dotted appearance at close inspection.
1 region
x 0.30 · y 0.18 · w 0.40 · h 0.26 (medium) - Fit appearanceShirt appears close to the body across the chest and shoulders with minimal drape on the torso.
1 region
x 0.22 · y 0.12 · w 0.56 · h 0.46 (high)
Other
Studio front-facing product shot on a light neutral background showing a model wearing the shirt; image framed to mid-thigh with soft even lighting and minimal shadows.
- Model and poseMale model standing facing slightly toward camera with arms relaxed at sides; full face, shoulders and torso visible.
1 region
x 0.08 · y 0.02 · w 0.84 · h 0.96 (high) - Styling propThe model is wearing dark maroon shorts that are visible below the shirt; these shorts are a styling element and not described as the product.
1 region
x 0.28 · y 0.66 · w 0.44 · h 0.20 (high) - Background and lightingEven neutral light gray background with soft studio lighting producing minimal harsh shadows and a slight shadow under the model.
- Crop and framingImage framed from above the head to mid-thigh, centered horizontally on the model.
Colors
white· body- SilhouetteSleeveless muscle tank with a straight torso panel and a crew neckline; the shirt covers torso to just below the waist and the armholes are cut to expose the upper arms.
- 02
Product
Rear view of a sleeveless white muscle-style tank top with wide armholes, narrow crew neckline, visible top-center row of small square perforation or print, and a slightly curved stitched hem; smooth lightweight knit fabric visible across the back.
- Overall silhouetteSleeveless muscle-style tank top shown from the back with wide armholes, straight vertical sides, and a gently curved bottom hem.
1 region
x 0.17 · y 0.07 · w 0.66 · h 0.78 (high) - NecklineNarrow crew neckline with visible topstitching and a slightly raised binding around the neck opening.
1 region
x 0.37 · y 0.06 · w 0.26 · h 0.07 (high) - Upper-back markingA vertical row of small square marks (three or four) centered just below the neckline; appear as printed or micro-perforated squares.
1 region
x 0.48 · y 0.12 · w 0.03 · h 0.05 (high) - Fabric appearanceSmooth, lightweight knit with a slight sheen and very fine texture across the back; fabric lies flat without visible patterning except subtle texture.
1 region
x 0.20 · y 0.12 · w 0.60 · h 0.60 (high) - Armhole finishArmholes cut wide with a narrow hemmed edge and visible topstitching following the arm opening curve.
2 regions
x 0.11 · y 0.14 · w 0.20 · h 0.38 (high); x 0.69 · y 0.14 · w 0.18 · h 0.38 (high) - Bottom hem stitchingVisible double-row topstitch along the curved bottom hem creating a narrow finished edge.
1 region
x 0.20 · y 0.72 · w 0.60 · h 0.16 (high)
Other
Studio rear-view photograph of a model wearing the tank top; plain light grey background, soft even lighting, and partial view of other clothing items (shorts) not part of the analyzed product.
- Shot compositionFull-body rear-facing studio shot cropped with the model centered; tank top fills the central vertical area of the frame.
- Background and lightingEven neutral light grey studio background with soft diffuse lighting producing minimal shadows.
- Visible non-product clothingMaroon athletic shorts with white piping are visible below the tank top and are separate from the white tank top being described.
1 region
x 0.20 · y 0.78 · w 0.60 · h 0.20 (high) - Model presencePhotographed on a male model shown from the back; arms and shoulders provide context for fit and armhole shape.
1 region
x 0.10 · y 0.10 · w 0.80 · h 0.86 (high)
Colors
white· body- Overall silhouetteSleeveless muscle-style tank top shown from the back with wide armholes, straight vertical sides, and a gently curved bottom hem.
- 03
Product
A sleeveless white crew-neck muscle T-shirt worn on a model; smooth, fitted torso with capped arm openings and a sewn neckline.
- SilhouetteSleeveless crew-neck tank with capped shoulder openings and a close, fitted cut through the torso.
1 region
x 0.18 · y 0.06 · w 0.64 · h 0.55 (high) - Neckline finishNarrow sewn rib or folded neckline seam forming a round crew neck.
1 region
x 0.34 · y 0.06 · w 0.33 · h 0.08 (high) - Arm opening trimArm openings end in a narrow folded or sewn edge without visible raw hem or additional fabric extension.
2 regions
x 0.18 · y 0.06 · w 0.18 · h 0.24 (high); x 0.64 · y 0.06 · w 0.17 · h 0.26 (high) - Surface textureSmooth, uniform knit or jersey fabric with no visible pattern or prints.
1 region
x 0.24 · y 0.14 · w 0.52 · h 0.40 (high) - Absence of markingsNo visible logos, graphics, or printed text on the front or shoulders of the shirt.
1 region
x 0.22 · y 0.08 · w 0.56 · h 0.48 (high)
Other
Lifestyle studio shot showing a male model wearing the shirt with additional clothing and a tote bag; plain light gray background and soft even lighting.
- Model and poseMale model walking forward, left leg stepping, head turned slightly to his left, holding a tote bag in his right hand and jacket tied around his waist.
1 region
x 0.06 · y 0.00 · w 0.88 · h 1.00 (high) - Prop - tote bagDark gray fabric tote bag carried in right hand containing folded garments including a visible maroon item and a white item draped over the bag.
1 region
x 0.63 · y 0.62 · w 0.25 · h 0.29 (high) - Prop - tied jacketLight gray jacket tied at the waist with visible pocket flaps and gathered cuffs hanging at the front.
1 region
x 0.26 · y 0.49 · w 0.34 · h 0.35 (high) - Shoes and socksWhite athletic sneakers and white crew socks visible on the model's feet.
1 region
x 0.22 · y 0.82 · w 0.28 · h 0.16 (high) - Background and lightingPlain light gray studio background with soft, even lighting producing faint shadows beneath the model.
Colors
bright white· body- SilhouetteSleeveless crew-neck tank with capped shoulder openings and a close, fitted cut through the torso.