Men's Mountaineering Waterproof Overtrousers - Alpinism Grey

Ref :
Key feature
The two-way zip with full-length opening lets you put on remove crampons or skis. The ergonomic design with pre-shaped knees gives you optimal freedom of movement.
Users reviews
4.04 / 5 69 ratings

Products benefits

Freedom of movement
Gusseted crotch. Pre-shaped knees.Adjustable waistband.
Textile is waterproof up to 30,000 mm water pressure before washing.
Fabric weight = 147 gsm. Reinforced component on lower leg.
Breathable membrane (9<RET<12), with option to ventilate thanks to two-way zip.
Easy dressing
2-way zip with full length opening for fitting crampons or skis to feet
Water repellent
Water-repellent textile.
Pockets are accessible when wearing a harness.
Ease of use
Elasticated adjustable waistband. 2 zip pockets. Adjustable fastening at ankle.


Main fabric : 100.0% Polyamide Pocket : 100.0% Polyester Yoke : 100.0% Polyester Coating : 100.0% Polyurethane
Approved by
Team SIMOND mountaineers for mountain ascents.Especially in ice gullied (ex: Rébuffat Gully, Tour Ronde, Mont Blanc Massif).
2 years

Additional information

- Elasticated waistband, adjustable on either side. - Flat elasticated waistband that's compatible with wearing a harness. - Pre-shaped knees, reinforced lower leg for protection from crampon spikes. - Elasticated drawstring and adjustable lower leg - Two zip pockets. - Zip fly. The full length 2-way zip opens from the top, letting you to fit crampons or skis, and allows you to relieve yourself without having to remove Hardshell pants.
Straight leg cut Product measurements in size 36": Waist measurement: 111 cm Crotch length: 84 cm
Product's waterproofing
The overtrousers have been approved in a shower test under 100 litres of water / sqm / hour during 3 hours. This test reproduces the conditions of a heavy mountain downpour.
Fabric waterproofing
We measure a fabric's resistance to a water column, in mm (based on the ISO 811 standard). The higher the water pressure resistance, the more waterproof the fabric. Components 2000 mm waterproofing, resists up to 2000 mm of water pressure (which is roughly equivalent to a rain shower lasting 2 hours). With waterproofing greater than 30,000 mm, the Alpinism overtrousers offer an extremely high level of waterproofing.
Fabric breathability
To find out whether a fabric is breathable, we test its evaporate resistance or RET (based on the ISO 11092 standard). The lower the fabric's resistance, the more moisture, generated by an active body, is evaporated, and therefore the higher the fabric's breathability. We consider that if: - RET < 9 = highly breathable fabric - 9<RET<12 = breathable fabric - RET > 12 = slightly or not breathable fabric. If pants have a RET between 9<RET<12
Product's breathability
In addition to the main fabric's breathability, these trousers have been designed with two side zips, enabling air flow for temperature regulation and improved ventilation.
Full length two-way zip
This new generation 2-way zip offers the same waterproofing as a classic silicone zip (similar to those on pockets) while being more flexible, which improves the overtrousers compression when packed away. Plus, this zip is easier to handle, which helps to make it longer lasting. The 2-way zip and full length opening, allow you to fit or remove trousers, crampons, skis, which is an added bonus during a storm.

Users reviews

4.04 / 5 69 ratings
57 users recommended this product

At Decathlon, reviews are reliable.

  • Man
    30-39 years old
    23 September 2019
    Use since 2 to 8 weeks
    That review has been deposited on this product version

    I have one of these.. Used them 3 week back on a trekking trail..perfect fit and sturdy product, Just wanted ti know how do i wash them!

  • 01 February 2019
    Use since 2 to 8 weeks
    That review has been deposited on this product version

    Tested these is horrendous conditions in the lakes over the winter and they were perfect easy to get on and off and comfortable to wear highly recommend for keeping out wind and rain

  • 18 October 2018
    Use since 3 to 6 months
    That review has been deposited on this product version
    Winter trousers

    Good fit and sturdy with reinforcement sections. Full length zips are very useful. These are definitely a winter product, they become a bit sweaty in warmer climates