Have you ever faced a climb sweating under a layer that was too warm, only to feel the icy wind as soon as you stopped? This is the classic mountain scenario that the “onion” method solves perfectly. Dressing in layers is not just about being comfortable: it is the most effective way to protect yourself, adapt and experience the natural environment with awareness. Discover in this guide how to choose the right materials for each season, so as to transform every mountain outing into a unique experience.

Table of Contents

1. Why dress in layers in the mountains?
2. Baselayer : Merino Wool or Synthetic ?
3. Midlayer : Fleece or Synthetic Jacket ?
4. External shell : hardshell or softshell?
5. Tips for layering in every season​​
6. Common Mistakes When Dressing in Layers
7. Conclusions and how to complete your kit

1. Why dress in layers in the mountains?

The mountains are unpredictable: temperatures can change rapidly, a bright sun can turn into a downpour, and the wind can surprise you at altitude. Dressing in layers is the ideal solution for:

• Adapt to the weather : Add or remove layers based on conditions.
• Keep you dry : Breathable materials prevent sweat from contacting your skin.
• Stay light : Lightweight, performance technical layers allow you to move freely.

“Walking in nature means accepting its changes. Dressing right is the first step to living it fully.”

2. Baselayer: Merino wool or synthetic?

The baselayer is the first layer in contact with the skin. Its job is to manage sweat, keeping you dry and warm.

Merino wool

• Thermoregulating : suitable for hot and cold.
• Anti-odor : perfect for multi-day treks.
• Sustainable : natural and biodegradable.
• Brand examples : Icebreaker, Smartwool, Ortovox.

Synthetic materials

• Quick drying : perfect for aerobic activities.
• Cheaper than merino.
• Suitable for humid or intense conditions.

Pro Tip : Avoid cotton! It traps sweat and increases the risk of hypothermia.

3. Midlayer: fleece or synthetic jacket?

The mid layer retains the heat generated by your body, keeping you comfortable without compromising breathability.

Pile (fleece)

• Varies in thickness: microfleece, fleece 200, etc.
• Breathable and lightweight.
• Not waterproof: requires an external shell.

Synthetic jacket

• Technical padding such as Primaloft or Polartec Alpha.
• Retains heat even when wet.
• Ideal for cold climates or winter trekking.

“Each layer has its role: fleece warms, synthetic jacket protects. The right choice depends on your adventure.”

4. External shell: hardshell or softshell?

The outer layer protects against the elements, completing the layering system.

Hardshell

• Waterproof and windproof : for extreme conditions.
• Technical membranes: Gore-Tex®, eVent®, Dermizax.
• Perfect for intense trekking or difficult conditions.

Softshell

• Flexible and breathable : suitable for moderate climates.
• Protects from wind and light rain.
• More comfortable and versatile for dynamic activities.

Pro Tip : Always bring a shell, even in summer. In the mountains the weather changes in an instant.

5. Tips for layering in every season

Summer

• Lightweight baselayer (ultralight merino or synthetic).
• Fleece or softshell for evenings or high altitudes.
• Compressible rain shell in backpack.

Winter

• Thermal baselayer (medium thickness).
• Warm midlayer: Thick fleece or synthetic jacket.
• Hardshell for maximum protection.

Mid season

• Long-sleeved baselayer.
• Medium pile or softshell.
• Waterproof jacket for safety.

6. Common Mistakes When Dressing in Layers

1. Cotton as a baselayer : retains sweat and cold.
2. Too heavy items : better to wear several light layers.
3. Lack of a shell : Even in summer, a shell is essential.

7. Conclusions and how to complete your kit

Dressing in layers is a philosophy for living the mountain with awareness. Each layer has a key role, and finding the right combination means being prepared for any eventuality.

Want to complete your kit?
Explore our shop to find the perfect baselayers, fleeces and shells for your adventures. Be prepared and experience the mountains the right way.

Happy hiking and walk lightly! Share your experiences with us in the comments or on social media. Each story is a step towards a more respected and responsible mountain experience.