420 GSM Heavyweight Boxy Long-Sleeve T-Shirt | SIGNAL MX Signature
420 GSM organic cotton single jersey. Architectural Boxy fit. Crewneck. Softly peached outer face. Contrast embroidery.
A 420 GSM heavyweight long-sleeve T-shirt that pairs a softly peached outer face with clear black-and-white contrast. SIGNAL MX Signature is made from dense organic cotton single jersey, with face-only Triple Carbon Peach creating a fine, matte surface.
The Architectural Boxy silhouette balances generous chest room and controlled dropped shoulders with a relatively compact, non-cropped body. A crewneck keeps the neckline simple. Full-length set-in sleeves end in clean self-fabric openings, without ribbed cuffs or elastic bands.
Raised white tiger-head embroidery stands against the black colorway; raised black embroidery defines the white version. Internal Mobilon shoulder reinforcement and dimensional stabilization support the intended proportions, while a straight self-fabric hem completes the shape.
Wear it on its own with denim or beneath an open jacket. MX brings a softer outer surface to our heavyweight essentials.
Detail
Specification
Product family
420 GSM Signature Jersey
Main fabric
100% organic cotton, high-density single jersey
Main fabric weight
420 GSM, 420 grams per square meter
Neckline
Crewneck
Surface finish
Face-only Triple Carbon Peach; finely peached, matte cotton
Fit
Architectural Boxy; shared MX/BX long-sleeve measurements
Sleeves
Full-length set-in sleeves with controlled dropped shoulders
Sleeve openings
Clean, turned self-fabric finish; no ribbed cuffs or elastic bands
Bottom hem
Straight, turned self-fabric hem; no ribbed bottom band
Shoulder construction
Internal Mobilon reinforcement
Shape-setting process
Dedicated high-temperature dimensional stabilization
Seam construction
Three-needle, five-thread reinforcement at designated seams
Branding
Raised contrast tiger-head chest embroidery and woven side label
Colors
Black with white embroidery / White with black embroidery
Size range
XS–2XL; unisex
Triple Carbon Peach refines the outer face without adding a fleece lining or changing the fabric into French terry. SIGNAL’s contrast embroidery provides the collection identity; the sleeve openings and body hem remain clean self-fabric finishes.
MX Signature and BX Armor share the same Architectural Boxy long-sleeve fit: generous chest room, controlled dropped shoulders, and a relatively compact, non-cropped body. Their surface finishes differ, not their finished dimensions.
Our size labels are intentionally generous. Start with the body-chest guide, then compare a long-sleeve T-shirt you own with the finished measurements below. At a boundary between sizes, use your preferred proportions and the garment chart rather than assuming a universal size conversion.
Recommended Body Chest
Size
Body chest - cm
Body chest - inches, approx.
XS
92–102
36.2–40.2
S
102–112
40.2–44.1
M
112–122
44.1–48.0
L
122–132
48.0–52.0
XL
132–142
52.0–55.9
2XL
142–152
55.9–59.8
Finished Long-Sleeve T-Shirt Measurements
Size
Half chest
Body length
Shoulder width
Long sleeve
XS
58 / 22.8
70 / 27.6
53 / 20.9
57 / 22.4
S
63 / 24.8
72 / 28.3
55 / 21.7
58 / 22.8
M
68 / 26.8
74 / 29.1
57 / 22.4
59 / 23.2
L
73 / 28.7
76 / 29.9
59 / 23.2
60 / 23.6
XL
78 / 30.7
78 / 30.7
61 / 24.0
61 / 24.0
2XL
83 / 32.7
80 / 31.5
63 / 24.8
62 / 24.4
How to Measure
Measurement
How to measure
Body chest
Measure around the fullest part of your chest with the tape level and relaxed. This is a body circumference, not a flat garment width.
Half chest
Lay the garment flat and measure straight across between the underarm/side-seam intersections. Do not use an arbitrary below-armhole offset.
Body length
Measure from the high shoulder point at the neck attachment seam to the finished bottom edge, excluding collar height.
Shoulder width
Measure straight across the back between the shoulder-to-sleeve seam points.
Long sleeve
Measure along the upper sleeve from the shoulder-to-sleeve seam to the finished opening. Include the turned sleeve edge; do not measure from the center back of the neck.
Measure the garment dry and relaxed, without stretching it.
Check sleeve length as well as chest width: shoulder placement and arm length affect where the opening sits at the wrist. For additional guidance, see our Size & Fit Guide.
SIGNAL puts the contrast in the embroidery. Each garment has a solid black or white body with a raised tiger-head design in the opposite color.
Color option
Garment color
Chest embroidery
Black
Solid black
Raised white tiger-head embroidery
White
Solid white
Raised black tiger-head embroidery
The contrast design is shared across MX Signature, BX Armor, WX Core, and EX Essential. Each series keeps its own surface finish, fit, and hem construction. SIGNAL does not use VOID’s tonal embroidery or STRATA’s additional decorative washed-color finish.
The figures below are REALLY COOL®’s published reference results for the 420 GSM single-jersey material platform. They describe specific material tests, not the weight or performance of every finished garment.
Property
Brand-reported reference
Method reference
Length change after 50 wash cycles
−0.9%
ISO 6330 procedures
Width change after 50 wash cycles
−1.1%
ISO 6330 procedures
Hydraulic bursting strength
1,143 kPa
ISO 13938-1
Pilling resistance
Grade 4–5
ISO 12945-2
These are brand-reported material references, not individual test results for every STRATA color, finish, size, or production lot. The bursting and pilling results should not be read as results measured after 50 washes. Fabric testing does not replace garment-specific care.
Explore The Tactile Paradox for our approach to fabric and construction.
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.
Two long-sleeve series, one Architectural Boxy fit. Both use 420 GSM organic cotton single jersey, full-length set-in sleeves, clean self-fabric sleeve openings, and reinforced shoulder construction.
Detail
MX Signature
BX Armor
Fabric face
Face-only Triple Carbon Peach; finely peached and matte
Clean, unbrushed single jersey
Fit and measurements
Architectural Boxy; shared long-sleeve dimensions
Same as MX
Neckline
Crewneck
Crewneck
Sleeve opening
Clean, non-ribbed self-fabric finish
Same as MX
Body hem
Straight self-fabric hem
Same as MX
Choose it for
A softer, peached outer surface
The natural definition of unbrushed jersey
Choose by the surface you prefer, not by a different size chart. WX Core and EX Essential belong to the short-sleeve T-shirt range; they are not long-sleeve options.
Question
Answer
How is SIGNAL MX different from SIGNAL BX?
Both share the same Architectural Boxy long-sleeve pattern, finished measurements, and reinforced shoulder construction. MX has face-only Triple Carbon Peach for a softer, matte outer surface. BX retains the unbrushed jersey face.
What embroidery color comes with each T-shirt?
The black T-shirt has raised white tiger-head embroidery. The white T-shirt has raised black embroidery. Both are contrast designs, not tonal logos.
Are the sleeve openings ribbed?
No. The sleeves end in clean, turned self-fabric openings, without separate ribbed cuffs or elastic bands. The neckline is a crewneck.
Is the boxy fit cropped?
No. The body is relatively compact but not cropped. Compare the body and sleeve lengths with a long-sleeve T-shirt you own before selecting your size.
Topic
Details
Destinations
Shipping is available to selected international destinations. Available methods, charges, and delivery estimates appear at checkout.
Processing
Orders are typically processed within 1–3 business days after confirmation. Processing time is separate from shipping time.
Returns
Eligible return requests must be submitted within 16 days of delivery, subject to the Returns & Exchanges Policy and applicable consumer rights.
Condition
Returned items must meet the policy requirements, including being unworn, unused, unwashed, and returned with original tags attached.
Exchanges
Subject to approval, product availability, and destination requirements.
Read the Shipping & Delivery Policy and Returns & Exchanges Policy for complete terms.
