Portwest DX4 Hi-Vis Class 1 T-Shirt S/S – Contemporary Style Meets Professional Safety

The Portwest DX4 Hi-Vis T-Shirt represents the cutting edge of high-visibility workwear, bringing Portwest's most dynamic collection into the safety t-shirt category. Designed for professionals who demand both performance and contemporary styling, this short sleeve t-shirt delivers exceptional comfort without compromising on certified protection.

Engineered with an active fit using premium cooling fabric, the DX413 keeps you cool, dry, and comfortable throughout demanding workdays. The advanced 100% polyester mesh construction at just 150gsm provides superior breathability while the moisture-wicking properties actively draw perspiration away from your skin for effective temperature regulation.

The HiVisTex Pro segmented reflective tape is heat-applied for enhanced durability and flexibility. This innovative segmented design moves naturally with your body, delivering outstanding visibility without the stiffness associated with traditional reflective strips. The tape remains certified to EN ISO 20471 standards even after 50 washes, ensuring long-lasting visibility performance.

CE certified and UKCA marked, this t-shirt achieves EN ISO 20471 Class 1 high-visibility certification while the orange colourway additionally complies with RIS 3279-TOM Issue 2 for rail industry applications. The 40+ UPF rated fabric blocks 98% of harmful UV rays, providing essential sun protection for outdoor workers.

The slim fit design delivers exceptional comfort with contemporary aesthetics that transition seamlessly from worksite to leisure. Thoughtful features include a contrast collar, taped neck seam for irritation-free wear, and a radio loop for convenient communication device attachment. The fluorescent stripe and contrast colouring enhance both visibility and visual appeal.

Available in orange/black and yellow/black combinations across sizes XS to 5XL, the DX4 Hi-Vis T-Shirt suits workers in construction, highways, rail, utilities, and logistics who value both safety and style.

• Premium Cooling Fabric – 100% polyester mesh keeps you cool and comfortable
• Active Fit Design – Engineered for movement and all-day comfort
• HiVisTex Pro Segmented Reflective Tape – Heat-applied for flexibility and durability
• EN ISO 20471 Class 1 Certified – Compliant high visibility standards
• RIS 3279-TOM Issue 2 Compliant – Rail industry approved (orange only)
• 40+ UPF Rated Fabric – Blocks 98% of harmful UV rays
• Moisture Wicking Technology – Draws sweat away to keep you dry
• Slim Fit Design – Contemporary styling with exceptional comfort
• Contrast Collar – Enhanced style with professional appearance
• Radio Loop – Convenient attachment point for communication devices
• Taped Neck Seam – Extra comfort with reduced irritation
• CE Certified & UKCA Marked – Meets European and UK safety requirements
• Certified After 50 Washes – Long-lasting visibility performance
• Lightweight 150gsm – Ideal for warm weather and high-activity work

The Portwest DX4 Hi-Vis T-Shirt S/S (DX413) combines contemporary styling with certified safety performance. Featuring premium cooling fabric and an active fit design, this t-shirt keeps you comfortable during demanding work. HiVisTex Pro segmented reflective tape provides flexible visibility, while EN ISO 20471 Class 1 certification and RIS 3279-TOM compliance (orange) meet professional standards. The 40+ UPF rating offers UV protection, and moisture-wicking properties ensure all-day comfort. The slim fit design with contrast collar transitions effortlessly between work and leisure. CE certified, UKCA marked, sizes XS-5XL.

Q: What hi-vis class is the DX4 T-Shirt certified to? A: The Portwest DX4 Hi-Vis T-Shirt (DX413) is certified to EN ISO 20471 Class 1. This certification is maintained even after 50 washes, ensuring long-lasting visibility compliance. As a short sleeve t-shirt, Class 1 is appropriate for the amount of fluorescent and reflective material present.

Q: Is this t-shirt approved for rail industry work? A: Yes, the orange colourway of the DX4 Hi-Vis T-Shirt complies with RIS 3279-TOM Issue 2 standards for rail industry applications. The yellow colourway meets EN ISO 20471 but is not rail approved.

Q: What makes the DX4 T-Shirt suitable for hot weather work? A: The DX4 T-Shirt uses premium 100% polyester mesh fabric at just 150gsm, providing exceptional breathability. The moisture-wicking technology actively draws perspiration away from your skin, while the cooling fabric helps regulate body temperature. Combined with 40+ UPF protection for sun safety, it's specifically designed for warm weather and high-exertion work.

Q: How does the segmented reflective tape differ from standard tape? A: The HiVisTex Pro segmented reflective tape is heat-applied in sections rather than one continuous strip. This design allows the tape to flex and move with your body, providing greater comfort and mobility while maintaining high visibility. The heat application method also enhances durability compared to sewn-on alternatives.

Q: What sizes are available? A: The DX4 Hi-Vis T-Shirt is available in sizes XS through to 5XL, providing comprehensive coverage for workers of all builds.

Q: What is the difference between DX4 and other Portwest hi-vis ranges? A: The DX4 collection represents Portwest's most contemporary, lifestyle-influenced workwear. It features slim fit designs, premium cooling fabrics, and modern aesthetics that transition from work to leisure. Compared to standard hi-vis ranges, DX4 prioritises style alongside safety, while maintaining full certification compliance.

Q: How should I care for this t-shirt? A: Machine wash at maximum 40°C using a mild process. Do not bleach, tumble dry, iron, or dry clean. Drip line dry only. The garment is certified for up to 50 washes whilst maintaining EN ISO 20471 compliance.

THE DX4 COLLECTION DIFFERENCE

Work to Leisure: The New Standard in Hi-Vis Workwear

The Portwest DX4 collection represents a paradigm shift in safety workwear design. Rather than treating high-visibility garments as purely functional items, DX4 embraces contemporary styling that workers are proud to wear both on and off the job.

Contemporary Aesthetics – The slim fit design and contrast colour detailing create a modern silhouette that stands apart from traditional boxy hi-vis wear. The DX4 T-Shirt looks as good grabbing lunch as it does on site.

Premium Fabric Technology – DX4 garments utilise advanced fabric constructions that prioritise wearer comfort. The 150gsm polyester mesh in the DX413 delivers cooling performance typically associated with sportswear rather than workwear.

Thoughtful Design Details – From the taped neck seam that eliminates irritation to the radio loop that keeps devices accessible, every feature serves a purpose without compromising the clean design lines.

Complete System Integration – The DX4 collection includes everything from base layers to winter jackets, all designed to work together aesthetically and functionally. The hi-vis t-shirt layers perfectly under DX4 hoodies, softshells, and jackets.

UNDERSTANDING HI-VIS CLASSES

EN ISO 20471 Classification Explained

High-visibility garments are classified based on the minimum areas of fluorescent background material and retroreflective material they contain:

Class 1 – The minimum level of protection, suitable for low-risk environments where there is adequate separation between the wearer and vehicular traffic. T-shirts, due to their reduced surface area, typically achieve Class 1.

Class 2 – Intermediate protection offering greater visibility through increased material coverage. Often achieved with vests, waistcoats, and long sleeve garments.

Class 3 – Maximum protection with the highest visibility, typically requiring full sleeve coverage and often achieved with jackets or coveralls.

The DX4 T-Shirt achieves Class 1 certification, which is appropriate for:

• Support roles on construction sites
• Warehouse and logistics environments
• Maintenance work in controlled areas
• Leisure activities requiring visibility (cycling, running)
• Under-layer when combined with Class 2/3 outer garments

For higher classification requirements, consider pairing with a hi-vis vest or choosing from Portwest's Class 2/3 garment range.

RAIL INDUSTRY APPLICATIONS

RIS 3279-TOM Compliance

The orange colourway of the DX4 Hi-Vis T-Shirt meets RIS 3279-TOM Issue 2 (Rail Industry Standard – Track Orange Material) requirements, making it suitable for wear on or near the UK rail network.

Rail workers should note that orange high-visibility garments are mandated for track-side work on Network Rail infrastructure. The combination of EN ISO 20471 certification and RIS 3279-TOM compliance ensures the DX413 (in orange) meets the comprehensive requirements for rail industry personal protective equipment.

Workers should always verify current PPE requirements with their employer and site-specific protocols, as hi-vis requirements may vary by role and location within rail environments.