STRATA MX Signature - 420 GSM Washed Heavyweight Boxy Long-Sleeve T-Shirt
The Signature, Extended.
STRATA MX Signature brings our 420 GSM heavyweight organic cotton jersey into a boxy long-sleeve T-shirt designed for everyday wear and layering.
The Architectural Boxy Fit retains its generous chest volume, controlled dropped shoulders and relatively compact, full-length body. The sleeves extend the silhouette without adding unnecessary length to the torso.
The signature Triple Carbon Peach finish uses three stages of mechanical brushing to create a finely peached, matte surface with a soft, suede-like touch. STRATA's additional washed treatment introduces subtle variation and lived-in depth to Burnt Umber and Dark Earth, giving each color a distinct character without exaggerated distressing.
Beneath the tactile finish, Mobilon-reinforced shoulders, a structured neckline and dimensional stabilization support the intended shape. Full-length sleeves end in clean, non-ribbed openings, while raised white tiger-head embroidery adds a restrained point of contrast.
420 GSM Organic Cotton Jersey.
Architectural Boxy Fit.
Reinforced Neck & Shoulder Construction.
Triple Carbon Peach × STRATA Washed Finish.
Full-Length Sleeves. Year-Round Layering.
Substantial enough to wear on its own and considered enough to layer with outerwear.
An everyday essential that moves beyond a single season.
Feature
Details
Material Composition
100% Organic Cotton, exclusive of decoration
Organic Textile Program
GOTS-certified organic cotton jersey program
Fabric Weight
420 GSM Heavyweight Jersey
Knit Construction
High-Density Single Jersey
Yarn Configuration
16s/1 and 21s/2 Yarn System
Surface Finish
MX Triple Carbon Peach, Three-Stage Mechanical Brushing
Collection Treatment
STRATA Controlled Washed Finish
Silhouette / Fit
Architectural Boxy
Sleeve Construction
Full-Length Set-In Sleeves
Sleeve Openings
Clean, Non-Ribbed Self-Fabric Finish
Neckline
Structured Rib Crewneck
Shoulder Construction
Mobilon-Reinforced Shoulder Seams
Dimensional Processing
High-Temperature Dimensional Stabilization
Stitch Construction
Approved Three-Needle, Five-Thread Reinforcement at Specified Seams
Branding
Raised White 3D Tiger-Head Embroidery
Colorways
Burnt Umber / Dark Earth
Gender
Unisex
Available Sizes
XS / S / M / L / XL / 2XL
Triple Carbon Peach - The Tactile Expression
MX Signature introduces three stages of mechanical brushing to our 420 GSM organic cotton single jersey, creating a finely peached, low-reflection surface with a distinctive suede-like cotton hand.
The treatment changes how the jersey feels against the skin while preserving the substantial character of its heavyweight foundation. Across the full-length sleeves and body, the finishing is intended to maintain a consistent tactile appearance.
STRATA Washed Finish - Material Depth
STRATA adds a controlled washed treatment to the MX Signature surface, introducing subtle tonal variation and a lived-in quality without relying on harsh bleaching or heavily distressed effects.
Burnt Umber is a warm, oxidized brown with rich earthen undertones. The controlled washed finish brings subtle shifts in depth across the garment.
Dark Earth is a deeper, grounded brown with restrained tonal variation. The darker finish creates a quieter expression of the same washed jersey foundation.
Architectural Construction - Form & Stability
MX Signature shares the Architectural Boxy pattern with BX Armor. Its broad chest, controlled dropped shoulders and straight body create a compact, defined silhouette without a cropped hem.
Mobilon reinforcement supports the shoulder seams, while high-temperature dimensional stabilization is applied to help maintain the intended proportions. A structured rib neckline and reinforced stitching complete the construction.
Full-Length Sleeves - A Considered Extension
The full-length set-in sleeves are developed around the same Architectural Boxy shoulder pattern. Their controlled volume follows the arm without exaggerated tapering, finishing near the wrist with clean, non-ribbed openings.
The result is a long-sleeve T-shirt designed to stand on its own or sit naturally beneath outerwear, bringing the signature heavyweight jersey into a wider range of everyday combinations.
Our 420 GSM organic cotton single jersey foundation has been evaluated through laboratory testing for dimensional stability, fabric strength, pilling resistance and colorfastness.
Performance Metric
Reported Result / Standard
Extended Wash Testing
50 wash-and-dry cycles under documented test conditions
Length Dimensional Change
Approximately −0.9%
Width Dimensional Change
Approximately −1.1%
Dimensional Test Reference
ISO 6330
Care-Label Shrinkage Specification
≤3.0% — specified acceptance limit
Bursting Strength
1,143 kPa
Bursting Test Standard
ISO 13938-1
Pilling Resistance
Grade 4–5
Pilling Test Reference
ISO 12945-2
Colorfastness
Laboratory evaluated under applicable test conditions
Colorfastness References
AATCC 8 / ISO 105-X12
Built Around Measurable Standards
Fabric weight establishes the foundation, but performance depends on more than weight alone. We evaluate our organic cotton jersey for how it responds to washing, physical stress and everyday surface wear.
These results refer to the laboratory-tested jersey samples under the documented conditions. They are shared material references, not separate finished-garment test guarantees for every STRATA colorway, brushing treatment or long-sleeve size.
For a deeper look at our materials and testing approach, explore The Tactile Paradox.
Architectural Boxy Fit - Structured, Not Cropped
The STRATA MX Signature long-sleeve T-shirt follows the same Architectural Boxy pattern as our MX Signature and BX Armor short-sleeve T-shirts.
Its fit is defined by generous chest volume, controlled dropped shoulders and a relatively compact, full-length body. Full-length sleeves add coverage without changing the established torso proportions.
The silhouette is intentionally roomy yet structured, rather than long, flowing or excessively oversized.
Size Reference
Our size M is developed around the body proportions of a wearer who typically chooses men's XL in many US or European brands, while delivering our intended Architectural Boxy silhouette.
This is a fit recommendation, not a universal international size conversion. Compare your own body measurements and the finished garment dimensions before selecting a size.
Unisex Size Guide - Recommended Body Chest
Size
Chest (cm)
Chest (in)
XS
92–102
Approx. 36–40"
S
102–112
Approx. 40–44"
M
112–122
Approx. 44–48"
L
122–132
Approx. 48–52"
XL
132–142
Approx. 52–56"
2XL
142–152
Approx. 56–60"
Finished Garment Measurements (cm)
Size
Half Chest
Body Length
Shoulder Width
Long Sleeve
XS
58
70
53
57
S
63
72
55
58
M
68
74
57
59
L
73
76
59
60
XL
78
78
61
61
2XL
83
80
63
62
All values represent finished garment measurements in centimeters, taken with the garment laid flat without stretching.
Chest: Measure around the fullest part of your chest with the tape level and relaxed.
Half Chest: Lay a long-sleeve T-shirt flat and measure across the chest at the corresponding reference point.
Body Length: Measure from the high shoulder point to the bottom of the finished hem.
Shoulder Width: Measure across the back between the shoulder seam reference points.
Long Sleeve Length: Measure from the dropped shoulder seam to the finished sleeve opening, following the upper sleeve.
For long-sleeve garments, arm length and preferred wrist coverage are especially important. Compare these measurements with a garment you already own and enjoy wearing.
See our Size & Fit Guide for more information.
Our 420 GSM heavyweight long-sleeve T-shirts are developed in two series: MX Signature and BX Armor.
Both share the same organic cotton single jersey foundation, Architectural Boxy pattern, reinforced shoulder construction and dimensional stabilization. Their defining difference lies in the fabric surface.
Series
Fit
Distinctive Detail
MX Signature
Architectural Boxy
Triple Carbon Peach, softly peached matte finish
BX Armor
Architectural Boxy
Clean, unbrushed heavyweight single jersey
MX Signature - The Tactile Expression: Three stages of mechanical brushing bring a softer, suede-like hand to the structured jersey foundation.
BX Armor - The Structured Expression: An unbrushed jersey surface retains the original character of the knitted fabric, paired with the same reinforced Architectural Boxy construction.
Both long-sleeve series are developed across SIGNAL, VOID and STRATA.
SIGNAL expresses identity through contrast embroidery. VOID uses matching tonal embroidery for a more restrained appearance. STRATA introduces controlled washed finishing in earth-inspired colorways.
The choice between MX Signature and BX Armor comes down to fabric surface: softly peached or naturally unbrushed. Both share the same Architectural Boxy fit and reinforced construction
Our short-sleeve heavyweight T-shirts are also developed in EX Essential and WX Core, which use a separate Oversized Relaxed fit family.
Fabric Composition
100% Organic Cotton
420 GSM High-Density Single Jersey
Exclusive of Decoration
Garment Care
Machine wash cold (maximum 30°C).
Turn the garment inside out before washing.
Wash with similar colors; wash dark colors separately.
Do not bleach.
Do not tumble dry.
Reshape gently and line dry in the shade.
If ironing is permitted by the care label, use low heat on the reverse side and avoid direct contact with the embroidery.
Gentle care helps maintain the garment's washed appearance.
Always follow the care instructions attached to the individual garment.
Worldwide Shipping
REALLY COOL® offers shipping to selected destinations worldwide.
Shipping methods, estimated delivery times, and applicable charges are displayed at checkout.
Orders are typically processed within 1–3 business days after confirmation.
Returns & Exchanges
Eligible return requests must be submitted within 16 days of delivery, unless otherwise required by applicable consumer protection laws.
Returned products must meet our stated return conditions, including being unworn, unused, unwashed, and returned with original tags attached.
Exchanges are subject to approval, product availability, and destination requirements.
For full details, please review:
Shipping & Delivery | Returns & Exchanges
