HYLJE Classifications
Warmth rating
The HYLJE warmth classification is indicative. It is designed with the assumption that base and mid-layers are worn underneath according to the weather—the colder the temperature, the warmer the layers. When considering a suitable overall, it is also advisable to check our recommended usage guidelines. Choosing the right overall is significantly influenced by how actively you move while wearing it.
No snowflakes: No thermal insulation.
One snowflake: Lightweight, maximum 50 g/m² padding, minimal insulation.
Two snowflakes: 80 g/m² padding, good insulation, suitable for temperatures down to -15°C.
Three snowflakes: 150 g/m² padding, very good insulation, effective even in severe cold.
Four snowflakes: Thick 200 g/m² padding, designed for extremely cold and demanding conditions.
Breathability
The breathability rating is provided for fabrics that are functional, meaning they keep water out while still allowing moisture to escape through the fabric. There are various standards for measuring breathability. HYLJE breathability levels are comparable to the ASTM E96BW-1995 standard. The measurement represents the amount of moisture (in grams) that passes through a square meter of fabric within 24 hours. The higher the number, the more moisture the fabric can transfer from the inside to the outside.
No symbols: Non-breathable membrane fabric, no breathability rating.
One vapor symbol: Breathability of at least 4,000 g/m²/24 h, providing moderate ventilation, suitable for very light activity.
Two vapor symbols: Breathability of at least 5,000 g/m²/24 h, offering good ventilation, suitable for light activity.
Three vapor symbols: Breathability of at least 8,000 g/m²/24 h, ensuring very good ventilation, suitable for active movement.
Four vapor symbols: Breathability over 10,000 g/m²/24 h, offering excellent ventilation, suitable for intensive exercise, such as backcountry skiing and long hikes.
Waterproof rating
All HYLJE products marked with water drop symbols are waterproof. The waterproof level is indicated by the water column measurement, which tells how much water pressure the fabric can withstand before it starts to leak. The water column value is expressed in millimeters (mm).
Please note that seam taping, carrying a backpack, or prolonged pressure on one spot (e.g., carrying a firearm or heavy gear) can also affect the overall waterproof performance of the product.
No water drops: Non-membrane fabric, not waterproof.
One water drop symbol: Water column up to 5,000 mm – provides short-term protection against light drizzle.
Two water drop symbols: Water column over 8,000 mm – offers good protection against drizzle and sleet, suitable for extended wear in wet conditions.
Three water drop symbols: Water column over 10,000 mm – withstands heavy rain for prolonged periods, suitable for sitting on wet surfaces.
Four water drop symbols: Water column over 12,000 mm – designed for demanding conditions and heavy rain.
How to Identify Terms Used in Shell Clothing
The properties of technical clothing, including HYLJE® overalls, are described using various terms. We have attempted to illustrate these features with different symbols and a four-level warmth classification developed specifically for our products.
Inspired by our partner Foxa, we decided to clarify this terminology jungle for our followers. Most of our overalls use Foxa Action series fabrics as the outer material. These fabrics are designed specifically for outdoor activities, trekking, and extended time spent outdoors. Their key features include waterproofing, breathability, and water resistance.
Waterproofing
Waterproofing is measured by the hydrostatic pressure test according to the EN ISO 811 standard. In this test, gradually increasing water pressure is applied to the fabric until water starts to seep through. The water column value represents the pressure at which water begins to penetrate the fabric. This value corresponds to our water drop symbols.
Waterproofing is a crucial feature when you know you will be moving in unpredictable conditions. Moisture quickly causes cold and can be extremely dangerous in extreme weather conditions.
Water Resistance
Water resistance is measured using the EN ISO 4920 standard spray test. In this test, water is sprayed onto the fabric. The more water beads up on the surface and rolls off, the better the fabric repels water.
Often, water resistance and waterproofing go hand in hand because if water cannot penetrate the fabric structure, it remains on the surface. Action fabrics, such as those used in HYLJE Action Light and Action Light Camo, typically have a spray rating of 4/5.
Washing reduces water resistance, but tumble drying or heat treatment can help restore it. HYLJE classifications do not have a separate symbol for water resistance.
Breathability
Breathability can be measured using several standards, such as ASTM E96-05 or JIS L1099. Breathability indicates how much water vapor passes through the fabric. The higher the value, the more moisture escapes. However, different test conditions may yield varying results, making comparisons difficult.
Breathability can also be measured by water vapor resistance (EN ISO 11092), which tells how much a material resists vapor from passing through.
Breathability is closely related to fabric density and wind resistance (EN ISO 9237), which measures air permeability. Many Action fabrics have an air permeability of 0, meaning that the fabric does not allow wind to pass through, which is important in harsh weather conditions. In HYLJE classifications, breathability is represented by the vapor symbol.
Breathability is essential when a garment is meant for active use. However, if you remain mostly stationary, wind resistance might be more important. Personal preference and layering choices also affect breathability needs.
Warmth
In HYLJE classifications, in addition to the previously mentioned categories, warmth is also considered based on the thickness of the insulation used in the overall. Warmth is a crucial feature in overalls, as thicker models must keep the wearer warm even in extreme cold conditions.
The need for warmth becomes especially important in severe cold, and its necessity depends on the activity level while wearing the overall. If you move a lot, you may not need a thick overall. However, if you remain stationary or work outdoors in freezing temperatures, a thicker overall is recommended.
What Outer Fabrics Are Used in HYLJE Clothing?
HYLJE® overalls and other outdoor garments use Foxa outer fabrics, manufactured in Forssa, Finland. You can find detailed information on all fabrics on Foxa’s website.
Fabrics Used in Overalls:
- HYLJE Action Light → Action Light
- HYLJE Action Camo → Action Mistral
- HYLJE Snow Camo M05 → Viking Snow Camo
- HYLJE Professional → Action Sailing
- HYLJE Xtreme → Action Arctic
- HYLJE Shamaani Thermal Jacket → Action Arctic
- HYLJE Polar C Series → Action Arctic
- HYLJE Polar C Junior & HYLJE Touring Pro → Action Arctic
- HYLJE Winter Woodland M05 → Viking M05 Winter Woodland
