Sievi ALASKA TRX XL+ S3S (sizes 39-48)

The Sievi Alaska TRX XL+ S3S safety boots are engineered for professionals who require reliable foot protection in cold weather working conditions. These boots combine advanced safety features with exceptional thermal insulation to deliver comprehensive protection and comfort during extended periods in challenging environments.

The Sievi Alaska TRX XL features a metal-free construction that includes an aluminium toecap and composite perforation-resistant midsole. This metal-free design eliminates concerns about cold transfer through metallic components while maintaining full compliance with EN ISO 20345:2022 S3S CI FO HRO SC SR safety standards. The absence of metal also makes these boots convenient for workers who frequently pass through security checkpoints or work near electrical installations.

Thermal protection stands as a primary strength of the Sievi Alaska boots. The upper material consists of PU coated leather that provides durability and weather resistance. Inside, a 100% wool lining creates a natural insulating layer that regulates temperature and manages moisture effectively. The boots incorporate PrimaLoft thermal insulation manufactured from 90% recycled materials, demonstrating environmental responsibility while delivering superior warmth retention. Heat-reflective aluminium insoles further enhance thermal protection by reflecting body heat back toward the foot rather than allowing it to dissipate into cold ground surfaces.

The sole system of the Sievi Alaska TRX XL utilizes the specialized Sievi TractionPro friction technology. This double density PU/RU sole construction provides excellent grip on various surfaces, which proves essential when working on slippery or uneven terrain in winter conditions. The sole design incorporates multiple safety certifications including slip resistance on both ceramic tiles with cleaning agents and steel surfaces with glycerol, fuel oil resistance, heat resistance up to 300 degrees Celsius, and cold insulation properties.

Practical design elements enhance the usability of these S3S safety boots. A side zipper allows for quick and easy entry and removal, reducing the time and effort required when donning or doffing the boots during work shifts. This feature proves particularly valuable when wearing thick socks or dealing with cold-stiffened fingers. The water-repellent treatment on the upper material helps keep feet dry in wet conditions, though these boots are designed primarily for cold weather rather than full waterproof immersion.

The Sievi Alaska construction addresses the specific challenges faced by workers in cold environments across various industries. Whether working in construction, logistics, maintenance, or outdoor industrial settings during winter months, these boots provide the necessary protection against impact, penetration, and thermal stress. The combination of safety certifications ensures compliance with workplace safety requirements while the comfort features support productivity during long working hours.

Available in sizes ranging from 39 to 48, the Sievi Alaska TRX XL+ S3S accommodates a wide range of foot sizes. The product code 48-52432-173-02M identifies this specific model within the Sievi safety footwear range. The S3S classification indicates these boots meet stringent requirements for closed-back footwear with toe protection, antistatic properties, energy absorption in the heel region, penetration resistance, water resistance of the upper, and additional slip resistance characteristics.

The environmental consideration demonstrated through the use of recycled materials in the PrimaLoft insulation reflects modern manufacturing priorities without compromising performance. This sustainable approach to thermal insulation allows workers to maintain their safety standards while supporting environmentally conscious purchasing decisions.

The Sievi Alaska represents a comprehensive solution for cold weather work safety, integrating protective features with thermal management and practical usability. The metal-free protection system, wool lining, recycled insulation materials, and advanced sole technology combine to create footwear that addresses both safety regulations and the real-world comfort needs of workers facing cold conditions. These boots demonstrate how technical innovation and thoughtful design can meet the demanding requirements of professional work environments while maintaining focus on user comfort and environmental responsibility.

Size 

39 - 48

Product code 

48-52432-173-02M 

Safety class 

EN ISO 20345:2022 S3S CI FO HRO SC SR

Toecap 

Aluminium

Perforation Resistant Midsole 

Composite PS

Sole material 

Double density PU/RU, TractionPro

Upper material 

PU coated leather