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PrimaLoft – discover the advanced technology in 4F’s winter footwear

An outfit that allows you to pursue your passions is a basic piece of equipment for anyone hitting the slopes or trails in winter. If you already have your jacket, trousers or thermal underwear ready, now focus on shoes. In 4F’s winter collection, you will find styles featuring PrimaLoft insulation. What does this layer give when it comes to footwear? Which pair should you choose? Let us explain!
In this article
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PrimaLoft insulation for winter footwear:
• Provides superior insulation against cold and moisture.
• Lightweight and breathable for unrestricted mobility.
• Durable and abrasion-resistant for long-lasting performance.
• 100% recycled (PCR) for eco-friendliness.
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4F's winter footwear with PrimaLoft insulation:
• ICECRACKER: For active hikers with 100g insulation.
• DCX: Lightweight snow boots with 200g insulation.
• INUA: Tall snow boots with 400g insulation for harsh winter conditions.
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Care instructions for PrimaLoft insulated footwear:
• Gently clean only the exterior with mild detergent.
• Avoid tumble drying.
• Let shoes dry at room temperature.
• Do not bleach, use hot steam, dry-clean, or add fabric softeners.
Short summary
A few words about what PrimaLoft really is
PrimaLoft insulation is the undisputed leader in thermal insulation. Utilising a patented waterproof finish, the PrimaLoft synthetic fibre not only keeps you warm, but also protects you from cold even when it gets wet.
The fluffy and pleasant-to-touch structure of the insulating fabric guarantees freedom of movement, while the super-lightweight properties affect unrestricted mobility, no matter the situation. PrimaLoft, therefore, becomes both the optimal solution for aficionados of outdoor activities and an excellent choice for those who appreciate high quality and product durability.
What does this type of insulation provide?
PrimaLoft mainly ensures comprehensive protection against cold and moisture. Excellent thermal insulation properties make the footwear an ally in harsh weather conditions. PrimaLoft is a hydrophobic material that dries instantly, preventing the growth of bacteria and fungi. In addition, it helps keep the skin dry and effectively wicks sweat away.
Soft and flexible structure results in the inside of the shoe adapting to the foot, which affects the freedom of movement. Let’s also highlight the exceptional lightness and compactness of PrimaLoft while maintaining high thermal parameters. Breathability and hypoallergenic properties are undoubtedly additional benefits, making PrimaLoft a safe choice regardless of the user’s skin type or possible allergies.
PrimaLoft insulated boots from 4F
New styles of hiking boots feature an innovative approach to footwear construction. First, we have increased the focus on stabilisation and resistance to abrasion. Among other things, this translates into long-term comfort and contributes to the fact that the shoe will not wear out in a short period of time. Second, the stable structure of shoes. The structure is made of durable materials, which means high thermal performance even after repeated use.
You should also know that the PrimaLoft insulation is 100% recycled (PCR). This is not only an eco-friendly approach, but also a guarantee of high quality. In addition, the use of three different levels of insulation (100g, 200g, 400g) allows the footwear to be tailored to individual needs.

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View product3 levels of shoe insulation in 4F products:
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100 g for very active people (Icecracker hiking shoe);
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200 g in the DCX high ankle shoe – a lightweight snowshoe for the city and beyond;
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400 g in the INUA tall snow boot, which will work well in harsh winter weather or during après-ski activities.
Thanks to PrimaLoft insulation, the boots retain 60% of their original thickness, even after 500,000 compressions. So you can be sure that you are buying one pair of shoes to last for many seasons to come.
Technical footwear in the 2023 winter collection
Winter collection includes shoes designed for winter activities and products from the sportstyle line. Below, we have presented styles for men and women:
1️⃣ ICECRACKER – technical hiking shoes
This is an offer for those who don’t shy away from challenges. The boots are insulated with modern Primaloft insulation (100 g/m2) and equipped with a waterproof Neo-Dry membrane. The non-slip Vibram sole with Arctic Grip technology gives you confidence when walking on slippery surfaces. A reinforced ripstop nylon upper and reflective details increase durability and enhance visibility after dark. The bellows tongue structure and shaped EVA insole are functional features you’ll appreciate, especially on mountain trails.
2️⃣ DCX – lightweight technical snow boots
In addition to Primaloft insulation (200 g/m2), the DCX snow boots also feature protective TPU reinforcements on the front of the upper and on the heel. The bellows tongue design and shaped EVA insole contribute to comfort while wearing the shoes, while the reinforced nylon upper is guarantees durability. The sole with deep rubber tread esnures that the shoe doesn’t slip on icy surface.

3️⃣ INUA – tall snow boots
Shoes that combine comfort and durability. Insulated with advanced Primaloft insulation (400 g/m2) and protected by a waterproof Neo-Dry membrane. The inside is padded with plush, and the high cut of the upper keeps the leg warm up to mid-calf. A bellows tongue design and shaped HI-POLY insole guarantee comfort. A compression-shaped CM-EVA midsole and an outsole with deep rubber tread protect against slipping.
How to care for shoes with PrimaLoft insulation?
Regular shoe care, especially those worn during winter season, is essential. Footwear with PrimaLoft insulation is vegan-friendly and easy to care for. To keep the shoes in pristine condition, it is recommended to clean gently only the exterior of the footwear. For example, you can prepare cold water with a very mild detergent first, and then use a soft sponge to clean the dirt and mud from the surface of the shoe. It is strictly forbidden to submerge the shoe in water.
It is also a good idea to avoid tumble drying 4F shoes. Shoes that are wet on the surface should be left to dry at room temperature, away from the radiator or any other source of high temperature.
What else should you remember about?
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Avoid using bleaching products.
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Do not use hot steam on your shoes.
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Do not dry-clean.
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Do not add fabric softeners.
With these few simple tips, your footwear will retain its original appearance and properties for much longer. What’s more, remember that shoes should be used for their intended purpose. Before purchase, pay attention to what type of insulation suits the conditions in which you plan to be wearing the shoes.
Winter demands the warmest solutions – choose products of the highest quality from 4F!
Available in selected models of 4F’s winter collection, PrimaLoft insulation means that no matter what the weather conditions are, you will always be comfortable and protected. Check out our new winter collection for women and men.
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