The base layer: the foundation of every effective layering system
The base layer is the starting point of any efficient layering system. Worn directly against the skin, it helps manage moisture, regulate body temperature, and ensure comfort during outdoor activities, whether hiking, snowshoeing, skiing, or simply going about your daily routine.
Why the base layer matters
Unlike mid-layers or insulating garments, the base layer isn’t just about warmth. Its primary function is to wick away moisture produced by the body, preventing the chill that comes from accumulated sweat.
A good base layer helps you:
- Maintain a stable body temperature
- Reduce moisture on the skin
- Improve comfort over long periods
- Maximize the efficiency of the layering system
👉 Check out our article on the layering system to learn more.
How to choose your base layer
The choice of a base layer depends on three key criteria: activity intensity, weather conditions, and material.
Based on activity intensity
- High activity (active hiking, cross-country skiing, snowshoeing): prioritize highly breathable, quick-drying fabrics.
- Moderate activity (walking, alpine skiing, everyday outdoor use): aim for a balance between warmth and moisture management.
- Low activity (commuting, urban outings, extended breaks): focus on comfort and warmth.
Based on the weather
In freezing weather or when conditions are variable, a high-performance base layer is crucial for preventing the “chill effect” as activity levels drop. By efficiently wicking sweat away from the skin, it reduces moisture contact. The better this moisture is managed, the more body heat is retained, ensuring lasting thermal comfort—even during rest periods or recovery.
Materials used in Chlorophylle base layers
At Chlorophylle, every base layer is crafted from technical textiles recognized for their performance, durability, and comfort. The choice of material is crucial depending on the intended use.
Alpha fleece – Polartec® Alpha
Composition : 63 % recycled polyester / 37 % polyester
The Alpha base layer is designed for dynamic cold-weather activities. Polartec® Alpha technology provides active insulation that adapts to the level of effort while ensuring excellent breathability. Moisture is quickly wicked away, reducing excessive heat buildup and enhancing comfort during movement. Its recycled polyester content reflects a more responsible approach, without compromising performance.
Our Alpha fleece
CHL Performance – Polartec® Power Wool®
Composition: 65 % polyester / 35 % wool
The CHL Performance model is designed for high-intensity activities where moisture management and breathability are essential. Thanks to Polartec® Power Wool® technology, it combines the natural ability of wool to regulate temperature and reduce odors with the performance of polyester for rapid sweat wicking. This base layer provides light to moderate warmth, making it ideal for sustained effort and variable conditions.
Our Chl Performance
CHL Plus – Polartec® Power Grid®
Composition: 92 % polyester / 8 % elastane
Polartec® Power Grid® features a distinctive grid structure that promotes excellent airflow while reducing the garment's weight. The CHL Plus base layer provides enhanced breathability, quick drying, and even warmth distribution, which is especially valued during prolonged activities.
Our CHL PLUS
CHL Ultra – Polartec® Power Stretch®
Composition: 90 % polyester / 10 % elastane
The CHL Ultra base layer is the warmest option in our range. It offers maximum stretch and a close-to-body fit for exceptional thermal comfort. Made from Polartec® Power Stretch® fabric, it moves with your body without any restriction while providing warmth, softness, and durability. This base layer is an excellent choice for colder conditions, whether you're outdoors or wearing it for everyday use.
Our CHL ULTRA base layers
| Base Layer Model | Main Material | Activity Intensity | Warmth Level | Usage Examples |
|---|---|---|---|---|
| Alpha Shirt | Polartec® Alpha – 63% recycled polyester / 37% polyester | Medium to high activity | Light to moderate warmth | Active hiking in cold weather, cross-country skiing, snowshoeing, sustained winter outings |
| CHL Performance | Polartec® Power Wool® – 65% polyester / 35% wool | High activity | Light to moderate warmth | Ski touring, cross-country skiing, winter running, cardio activities in cool to cold weather |
| CHL Plus | Polartec® Power Grid® – 92% polyester / 8% elastane | Moderate activity | Moderate warmth | Four-season hiking, everyday outdoor use, sustained activities in cool or cold weather |
| CHL Ultra | Polartec® Power Stretch® – 90% polyester / 10% elastane | Low to moderate activity | High warmth (warmest in the range) | Alpine skiing, snowmobiling, long static periods in the cold, very cold mountain days |
Cotton should be avoided.
Although comfortable, cotton absorbs moisture and retains it. Once wet, it dries slowly, which increases the feeling of cold. Synthetic fabrics, on the other hand, wick moisture more efficiently and provide better comfort during active conditions.
How to wear a base layer effectively
The base layer should be worn directly against the skin, without cotton underwear underneath, to enhance moisture wicking. To be truly effective, it must fit snugly against the body without causing compression or friction.
For optimal comfort outdoors:
- Choose a close-fitting cut to promote moisture transfer avoid loose-fitting clothing that traps moisture
- Adapt the material and thickness of the base layer to the intensity of the activity
- Add a mid-layer and an outer layer, depending on the conditions
When integrated properly into a layering system, the base layer helps maintain body heat and comfort during transitions between activity and rest.
The care of your technical underwear.
To ensure the longevity of your thermal underwear, it is essential to properly care for it with the right products. You must wash them on a delicate cycle and in fresh water. Using a mild, unscented soap, or one that is specialized for technical garments, and above all, never putting them in the dryer will guarantee a long life.
Consult our section on clothing care.
Discover our care products for technical clothing.
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