Socks I Posio Trekking Socks I UphillSport
- Ideal for trekking
- Finnish army multipurpose sock - Over 1 million pairs sold
- 3- Layer structure - Keeps feet warm and dry
- Thin structure - Still warm and durable
- Elastic sport shaft - Stays up
- Grip on arch - Better fitting
- 48 % Merino wool, NATIVA, 31 % Polyamide, 20 % Polypropylene
- Thermal rating 4 out of five
- Thickness light 1 out of three
Socks I Trekking Socks 3-Layer Duratech L4 With Merino
Crew socks designed for tough work conditions for people seeking comfort and durability. Made with a unique 3-layer Duratech structure and 48% Merino wool, they keep feet warm and dry in all conditions. The seamless toe construction prevents chafing, while the elastic sport shaft ensures your socks stay up during long hours on your feet.
- Proven in the Finnish army with more than a million pairs sold
- Unique triple-layer system delivers outstanding moisture management, durability, and long-lasting comfort
- Elastic sport shaft - stays up
- Grip on arch - Better fitting
- Seamless Toe Design: Eliminates chafing and hotspots, providing pain-free comfort throughout long workdays
- Lightweight Yet Warm: Thin profile with thermal rating 4 offers excellent insulation, making these socks ideal for both summer and winter use
Key Benefits
✅ Reinforced durability but lightweight and warm for heavy-duty use
✅ Regulated temperature and breathability for optimal comfort
✅ Antimicrobial properties to resist odour build-up
✅ Moisture-wicking technology to keep feet dry all day
✅ Melbourne based for for quick and easy delivery in Australia
Material Composition
- 48% Merino wool NATIVA
- 31% Polyamide
- 20% Polypropylene
- 1% Elastane
Pair weight 55 grams
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- Wool is a warm and breathable material.
- Sheep wool has excellent performance characteristics, as it breathes and insulates heat well.
- Self-renewing and biodegradable, natural fibre absorbs moisture well, does not wrinkle and straightens quickly.
- For wool products, airing rather than washing is sometimes sufficient.
- Wool is naturally fire-retardant, highly resistant to bacteria and mould.
UphillSport® is an outdoor lifestyle brand originating from Finland, renowned for its high-performance socks specifically engineered for extreme outdoor conditions. Rooted in the Tampere region—an area with over 200 years of rich textile manufacturing heritage—UphillSport benefits from unparalleled craftsmanship and innovation in textile production.
The brand is created and produced by Sukkamestarit Ltd, a Finnish company with a long-standing history in sock manufacturing since 1996. Leveraging decades of expertise, Sukkamestarit has honed advanced techniques to produce premium performance socks capable of withstanding the harsh, cold, and moist sub-Arctic climates typical of northern Finland.
Launched in 2014, the UphillSport® brand combines traditional textile heritage with cutting-edge technology, focusing on multi-layer sock systems that maximize breathability, moisture management, durability, and warmth. Each pair of UphillSport socks undergoes rigorous Arctic testing to ensure reliability in extreme weather conditions, making them a trusted choice for outdoor enthusiasts, athletes, and professionals alike.
UphillSport's product range includes specialized socks for hiking, running, skiing, fishing, and workwear, designed to provide unparalleled comfort and protection on any adventure—from Arctic expeditions to rugged Australian treks. The brand’s commitment to innovation and quality is further exemplified by its military-grade performance credentials, such as being worn during the Netherlands Marine Corps’ world record speed march under freezing temperatures.
Today, UphillSport stands as a premium sock brand that seamlessly blends Finnish tradition with modern technological innovation, dedicated to delivering durable, multi-layered socks that keep feet dry, warm, and supported no matter the challenge.
UphillSport® has revolutionized outdoor and performance socks through their pioneering Multi-layer System technology. At the heart of their innovation is a carefully engineered technical multilayer structure that allows the creation of socks that are remarkably warm while maintaining a slim and lightweight profile. Unlike traditional thick socks that rely solely on bulk to provide insulation, UphillSport® leverages the unique properties of different materials layered strategically to optimize performance.
Each layer in the Multi-layer System serves a specific function — from enhancing breathability and managing moisture, to increasing durability and delivering superior warmth in harsh conditions. This approach ensures that UphillSport® socks effectively regulate temperature and keep feet dry, even during intense physical activities or in extreme outdoor environments.
Ideal for active outdoor enthusiasts and performance athletes alike, these socks provide comfort and protection without compromising mobility or fit. Whether hiking, skiing, or engaged in tactical work, UphillSport® socks offer the technical advantages needed for high-performance demands.
Committed to continuous innovation, UphillSport® combines advanced manufacturing expertise with sustainable practices, ensuring their products are not only technically advanced but also environmentally responsible. This dedication to quality and sustainability solidifies UphillSport® as a leader in the development of next-generation outdoor performance socks.
Care instructions:
- pre-wash merino wool socks before use
- for merino socks, airing alone is often sufficient
- careful washing at a maximum temperature of 40 degrees Celsius
- use as light a spin as possible
- the use of a wash bag saves wear and tear
- do not use detergents containing rinsing agents or bleaching agents
- do not use a tumble dryer or drying programmes
- please note that merino wool socks will shrink in the wash, please shape/stretch the socks while damp to restore the original size
- use a lint remover - merino wool socks are easily linted by rubbing
See Size Chart






