SIGNAL MX Signature - 420 GSM Heavyweight Boxy Long-Sleeve T-Shirt

• 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 surface with a soft, suede-like tactile character.

The treatment brings a refined matte appearance to the heavyweight cotton while retaining the substantial character of the original jersey. Across the body and full-length sleeves, the finish provides a consistent tactile expression.

• SIGNAL Contrast Identity - A Distinctive Expression

SIGNAL explores the relationship between contrast, recognition and restraint.

Our signature raised 3D tiger-head embroidery is rendered in contrasting colors, bringing a clear visual identity to the clean surface of the heavyweight jersey.

Black Garment with White Contrast Embroidery: Raised white tiger-head embroidery stands against black heavyweight cotton jersey, introducing a sharp, recognizable detail to the garment's understated silhouette.

White Garment with Black Contrast Embroidery: Raised black tiger-head embroidery creates a defined graphic accent against white heavyweight cotton jersey, with the dimensional stitching adding texture to the contrast.

SIGNAL gives the signature emblem a more immediate visual presence. The contrast remains deliberately concentrated at the chest, allowing the fabric, fit and garment proportions to speak for themselves.

Combined with the softly peached Triple Carbon Peach surface, SIGNAL MX Signature brings a tactile dimension to a distinctly recognizable everyday essential.

• Architectural Construction - Form & Stability

MX Signature shares its Architectural Boxy pattern with BX Armor.

A broad chest, controlled dropped shoulders and a relatively compact, full-length body define the silhouette. Mobilon shoulder reinforcement, a structured rib neckline and dimensional stabilization support the garment's intended proportions.

Selected seams incorporate reinforced stitching as part of the shared MX/BX construction system.

• Full-Length Sleeves - A Considered Extension

The long-sleeve pattern extends the Architectural Boxy silhouette through the arms while retaining the same established torso proportions.

Full-length set-in sleeves finish near the wrist with clean, non-ribbed openings, without a tight sweatshirt-style cuff.

The result is a substantial everyday long-sleeve T-shirt designed for standalone wear and natural layering across the year.

Our 420 GSM organic cotton single jersey foundation has been evaluated through laboratory testing for dimensional stability, fabric strength, pilling resistance and colorfastness.

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

Finished Garment Measurements (cm)

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.

1. MX Signature - The Tactile Expression: Three stages of mechanical brushing bring a softer, suede-like hand to the structured jersey foundation.

2. 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