Men's long-sleeved merino wool trekking MT900 liner jacket

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The use of Merino wool in the design of this liner jacket guarantees thermal comfort down to 10°C when worn as a second layer.

The wool threads are coated for more durability. It also gives you breathability and warmth. Finally, it’s very practical with 2 hand pockets and one zipped chest pocket.

  • S Out of Stock
  • M undefined
  • L Out of Stock
  • XL undefined
  • 2XL Out of Stock
  • 3XL Out of Stock

Our services :

  • Free delivery for Decathlon brands orders above $399
  • All Decathlon products are eligible for lifetime return

Products benefits


Use of a wool-based fabric. Comfortable down to 10°C.


The main fabric uses polyamide-sheathed yarns for added strength


The inner structure, knitted in channels, helps maintain an ideal body climate

Freedom of movement

Very good stretch thanks to the addition of 4% elastane make it more comfortable


3 pockets with a zip for safety. Never lose anything in the mountains again!


This vest weighs approx. 365 g in size L. Perfect to take on a trek with you


Men's long-sleeved merino wool trekking MT900 liner jacket
Men's long-sleeved merino wool trekking MT900 liner jacket
Men's long-sleeved merino wool trekking MT900 liner jacket

Technical information

How does the MT900 wool liner jacket protect you from the cold?

With its structure, the wool easily traps air which is a very good insulator, thus preventing heat loss. We also took care to create a high collar that completely protects you from the cold. And we've added thumb loops to keep your hands nice and warm.

What is the advantage of the hybrid construction of the MT900 wool liner jacket?

The front panel is lined with very light insulation made up of fibres joined together by a mesh structure. The garment provides thermal regulation, breathability and protection from the wind.
The main fabric made from thick (260g/sqm) wool (63%) provides the right level of warmth.
A lightweight component (190 g/m²) under the arms improves breathability.

How to wash your MT900 wool liner jacket

We recommend you machine-wash your liner jacket at 30° on a normal cycle, preferably with liquid detergent.
Dry flat and NEVER tumble dry unless you want it to shrink by one or two sizes!

Product concept & technology

Product Composition

Main fabric 63% Wool, 24% Acrylic, 9% Polyamide, 4% Elastane Main lining 90% , 10% Elastane Front side fabric 100% Polyamide Cuff 86% Wool, 14% Polyamide Padding 100%


During the summer of 2020, several people independent of Decathlon tested this product. Rémi, for example, used the MT900 Wool liner jacket as his only protection against the cold during his Grande Traversée des Alpes along the GR5 trail. He was completely satisfied with it!

Maintenance advice

Machine wash - 30° max - normal

Do not bleach

Do not tumble dry

Do not iron

Do not dry-clean

User reviews

Questions & Answers