SIGNAL MX Signature - 420 GSM Heavyweight Crewneck Sweatshirt
The SIGNAL MX Signature is a 420 GSM heavyweight crewneck sweatshirt made from organic cotton French terry, combining a substantial feel with a relaxed, easy-to-wear Architectural Boxy Fit.
Designed with a roomy chest, dropped shoulders and full-length sleeves, it offers a comfortable fit that works equally well on its own or layered over a T-shirt. A ribbed crewneck, cuffs and hem complete its balanced shape.
The MX Signature Triple Carbon Peach finish gives the outer surface a soft, matte feel, while the unbrushed French terry loopback remains intact on the inside. The result is a substantial everyday layer with a distinctively smooth exterior.
SIGNAL introduces contrast through our signature 3D tiger-head embroidery. White embroidery stands out against the black cotton body, while black embroidery gives the white version a bold, graphic finish. Raised stitching brings depth to the design without overpowering the garment.
420 GSM Organic Cotton French Terry
MX Signature Triple Carbon Peach
Architectural Boxy Fit
Contrast 3D Embroidery
Ribbed Finishing
Wear it with denim, tailored trousers or relaxed sweatpants.
A heavyweight everyday essential with a clear identity of its own.
Feature
Details
Product Family
420 GSM Signature Loopback Jersey
Main Fabric
3-End French Terry
Main Fabric Composition
100% Organic Cotton
Fabric Weight
420 GSM Heavyweight
Outer Surface
Clean, dense jersey-appearance face
Inner Surface
Unbrushed Loopback Reverse
MX Signature Finish
Face-Only Triple Carbon Peach
Fit
Architectural Boxy
Sleeve Construction
Full-Length Set-In Sleeves
Neckline
2×2 Ribbed Crewneck, approximately 2.5 cm
Sleeve Cuffs
2×2 Ribbed, 7 cm
Bottom Hem
2×2 Ribbed, 7 cm
Rib Composition
95% Organic Cotton / 5% Elastane
Branding
Contrast 3D Tiger-Head Embroidery
Colorways
Black, White
Gender
Unisex
Sizes
XS / S / M / L / XL / 2XL
The main body is made from organic cotton French terry. Rib trims use a separate cotton/elastane blend for fit and recovery.
420 GSM French Terry - Substantial by Nature
This sweatshirt begins with our 420 GSM organic cotton French terry, developed with a smooth outer surface and unbrushed cotton loops on the inside.
Unlike a brushed fleece sweatshirt, the reverse retains its knitted loopback character. The result is a substantial fabric with a distinct feel and appearance, designed for standalone wear and easy layering.
Triple Carbon Peach - MX Signature
Our Triple Carbon Peach finish gives the outer face of the French terry a soft, matte feel without brushing the loopback interior.
The fabric retains its substantial weight and natural drape, creating a sweatshirt that feels comfortable while keeping its defined boxy shape.
Together with a ribbed neckline, cuffs and hem, the result is a versatile everyday layer that brings comfort and character into balance.
SIGNAL - Contrast by Design
SIGNAL brings a distinctive visual identity to the MX Signature crewneck through black-and-white contrast embroidery.
The Black version features raised white tiger-head embroidery, creating a striking contrast against the deep black cotton surface.
The White version reverses the pairing, using black embroidery on a clean white body for a crisp, graphic finish.
Both versions share the same 420 GSM organic cotton French terry, MX Signature Triple Carbon Peach finish and Architectural Boxy Fit.
The contrast makes the signature visible, while the heavyweight fabric and relaxed shape keep the overall design easy to wear.
Architectural Boxy Fit - Room to Move
The sweatshirt has a wide, balanced body, relaxed shoulders and full-length set-in sleeves, designed around its own heavyweight sweatshirt pattern.
A 2×2 ribbed neckline, 7 cm ribbed cuffs and a 7 cm bottom hem finish the shape without sharply tightening the wrists or waist.
It is intentionally roomy, but not cropped or excessively oversized.
Our 420 GSM French terry is developed around defined quality standards for weight, wash performance, surface appearance and colorfastness.
Performance Metric
Standard
Finished Fabric Weight
420 GSM
Fabric Weight Reference
ASTM D3776/D3776M
Dimensional Change
No more than 5%
Wash / Dimensional Test
ISO 6330 + ISO 5077
Pilling Resistance
Grade 4 or higher
Pilling Test
ISO 12945-2
Wash Colorfastness
Grade 4 or higher
Colorfastness Test
ISO 105-C06
Dry Rubbing Fastness
Grade 4 or higher
Rubbing Test
ISO 105-X12
Spirality / Seam Twist
No more than 3%
Quality Beyond Fabric Weight
Fabric weight is only one part of a well-made sweatshirt. We also consider how the material responds to washing, how its surface holds up to wear, and how the finished garment maintains its intended shape.
These figures are the defined performance and acceptance standards for the French terry program, not individual measured results for every finished colorway.
For more on our approach to material quality, explore The Tactile Paradox.
Architectural Boxy Fit
The REALLY COOL® MX Signature and BX Armor crewneck sweatshirts share the same dedicated Architectural Boxy pattern, developed for the weight and shape of our 420 GSM French terry.
Both feature a generous chest, controlled dropped shoulders, full-length set-in sleeves and a ribbed hem that finishes the body without excessive tapering.
The fit is intentionally roomy and substantial, but not cropped or excessively oversized.
Size Reference
Our size M is designed for the body proportions of someone who commonly wears a men's XL in many US or European brands, while delivering the intended REALLY COOL® boxy fit.
This is a fit recommendation, not a universal size conversion. Compare the measurements below with a sweatshirt you already own.
Unisex Size Guide - Recommended Body Chest
Size
Chest (cm)
Approx. Inches
XS
92–102
36–40"
S
102–112
40–44"
M
112–122
44–48"
L
122–132
48–52"
XL
132–142
52–56"
2XL
142–152
56–60"
Finished Sweatshirt Measurements (cm / inch)
Size
Half Chest
Body Length
Shoulder
Sleeve
XS
58 / 22.83
70 / 27.56
53 / 20.87
59 / 23.23
S
63 / 24.80
72.5 / 28.54
55 / 21.65
60 / 23.62
M
68 / 26.77
75 / 29.53
57 / 22.44
61 / 24.02
L
73 / 28.74
77.5 / 30.51
59 / 23.23
62 / 24.41
XL
78 / 30.71
80 / 31.50
61 / 24.02
63 / 24.80
2XL
83 / 32.68
82.5 / 32.48
63 / 24.80
64 / 25.20
Measurements are taken with the garment laid flat and relaxed.
Half Chest: Measured straight across the chest.
Body Length: From the high shoulder point to the finished bottom hem, including the 7 cm rib.
Shoulder Width: Across the back between shoulder seam intersections.
Sleeve Length: From the shoulder seam to the end of the cuff, including the 7 cm rib.
For the most reliable fit, compare these measurements with a crewneck sweatshirt you already enjoy wearing.
See our Size & Fit Guide for more information.
Our 420 GSM heavyweight crewneck sweatshirts are developed in two series: MX Signature and BX Armor.
Both share the same organic cotton French terry foundation, Architectural Boxy pattern, unbrushed loopback interior and ribbed construction.
Series
Fit
Defining Surface
MX Signature
Architectural Boxy
Softly peached, matte exterior
BX Armor
Architectural Boxy
Clean, unbrushed exterior
MX Signature - The Tactile Expression
A controlled Triple Carbon Peach finish softens the outer face, giving the substantial cotton a more refined touch.
BX Armor - The Structured Expression
An unbrushed exterior retains the direct character of the knitted face, with the same heavyweight foundation and boxy fit.
Both series are developed across SIGNAL, VOID and STRATA.
SIGNAL uses contrast embroidery. VOID keeps the branding tonal. STRATA introduces washed earth-inspired colors.
The choice between MX and BX comes down to how you want the sweatshirt to look and feel. The fit remains the same.
Fabric Composition
Main fabric: 100% Organic Cotton French Terry
Rib trims: 95% Organic Cotton / 5% Elastane
Fabric weight: 420 GSM
Exclusive of decoration
Garment Care
Machine wash cold, maximum 30°C, subject to the garment care label.
Turn the sweatshirt inside out before washing.
Wash with similar colors; wash dark colors separately.
Do not bleach.
Avoid tumble drying.
Reshape gently and line dry in the shade.
If ironing is permitted, use low heat on the reverse side and avoid direct contact with embroidery.
Gentle care helps preserve the washed color, natural cotton surface, and intended shape of the sweatshirt. 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
