Hardshell jacket · Men
Mountain Hardshell Jacket 10M
Our most protective hardshell, made for winter activities and long days on the mountain.
Oversized fit · Model is 191cm, 90kg, and wears L with Mountain INS Jacket 10M underneath
- For every product sold, we regreen 100 m² of land with Justdiggit
Recognised by · sold at
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Product description
Technical specifications
Lab-tested performance
We don’t license performance. We build it. We develop our fabrics, have them independently tested, and share the results.
Sustainability
Care & warranty
Try it on
Flagship store Amsterdam
Bilderdijkstraat 136HS, Amsterdam. Or order online, with 21-day returns in the EU.
Plan your visit
Choose your size
Highlights
Made for
- Skiing
- Mountaineering
Fit
- Athletic
- Regular
- Relaxed
Key specs
- Waterproof · Barrier CT Pro™
- 50,000+ mm
- Breathability · JIS L 1099 B-1
- 20,000+ g/m²/24h
- Weight
- 700 g
- Abrasion resistance
- 50,000+ rubs
Waterproof
Waterproofness is the height of a water column, in mm, that the fabric holds before water gets through. 50,000 mm is a column of water 50 metres high, roughly a 16-storey building, pressing on the fabric.
Lab-tested beyond 61,200 mm: all five fabric samples exceeded the test maximum (JIS L 1092 7.1, Method B). Our requirement for Barrier CT Pro™ is 50,000 mm.
Independently lab-tested. See the test results
Breathability
Lab result for this fabric: 27,685 g/m²/24h (JIS L 1099 B-1). Values from other test methods are not comparable.
Independently lab-tested. See the test results
Abrasion resistance
Independently lab-tested: abrasion resistance beyond 50,000 rubs.
Independently lab-tested. See the test results
Why you need this product
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Made for
Hardshell for high alpine and stormy days
An uninsulated hardshell with an oversized fit, made for skiing through storms and hiking above the treeline. Room to layer, freedom to move. Our toughest hardshell. Made with 100% recycled face fabrics for minimal impact.
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Technology
Barrier CT Pro™ 3-layer fabric
See the lab resultsOur own 3-layer waterproof-breathable fabric, independently lab-tested: 50,000+ mm waterproof, 20,000+ g/m²/24h breathable (JIS L 1099 B-1) and Grade 5 water repellency. PFAS-free, with the full lab results published.
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Details
Built for long days up high
Waterproof zips, a helmet-compatible hood and underarm vents to dump heat on the way up. Wear it over a fleece and an insulated layer when it turns cold.
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Certified B Corp™ · 1% for the Planet
The Cortazu Impact
Our impactWe are a Certified B Corp™ and a member of 1% for the Planet. For every product sold, we regreen 100 m² of land with Justdiggit.
Our goal: regreen 100 million m² of land. So far, our contributions have supported an estimated 10,951,429 m² of landscape restoration.

Barrier CT Pro™ · Lab results
Waterproof beyond 50,000 mm, independently lab-tested.
- mm waterproof
- 50,000+
- g/m²/24h breathable (JIS L 1099 B-1)
- 20,000+
- rubs abrasion resistance
- 50,000+
- water repellency (JIS L 1092)
- Grade 5
What our customers say
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Be the first to review the Mountain Hardshell Jacket 10M. Every Cortazu product comes with a 3-year warranty, and 21-day returns in the EU.
Read the reviewsTry it on
Flagship store Amsterdam
Bilderdijkstraat 136HS, Amsterdam. Or order online, with 21-day returns in the EU.
Plan your visitGood to know
Can I try it on first?
Yes, in our store at Bilderdijkstraat 136HS, Amsterdam.
How do I keep it waterproof?
Wash at 30°C with liquid detergent or a technical wash, without fabric softener. If water stops beading, wash and dry the jacket first, then reapply a water-repellent treatment.







