Why wear waterproof clothing in the mountains?
At altitude, the weather can change within minutes: good waterproof clothing make the difference between a controlled outing and coming back soaked. A waterproof jacket and trousers block rain and wind while wicking away perspiration, keeping you dry without a sauna effect during exertion. Unlike a simple water-repellent treatment, a garment with a membrane withstands prolonged rain and pressure from a pack or knees. A mountain clothing specialist since 1964, Cimalp designs equipment tested and approved by over 1,000 guides, built for the wettest conditions.
Waterproof jacket and trousers: full protection from rain
For effective protection, it is better to think in terms of a complete outfit rather than an individual item. The waterproof jacket protects the upper body, head and arms, while waterproof trousers or overtrousers keep your legs dry, even when sitting on a damp rock or in wet grass. Overtrousers, worn over another layer, slip into your pack and are ready as soon as the rain starts. Depending on the model, waterproof bib trousers provide even better lower-back protection on long, exposed outings. Find each category in our dedicated collections: waterproof jackets and waterproof trousers.
Membrane, sealed seams and water repellency: what makes a garment waterproof
Waterproofing relies on three complementary elements. The membrane, such as theUltrashell developed by Cimalp, blocks water while allowing moisture vapour to escape. Heat-sealed seams close the usual entry points for water, while a DWR water-repellent treatment makes rain bead on the fabric surface. To compare two models, a few criteria matter:
- Membrane waterproofing in driving rain
- Breathability to wick away perspiration
- Sealed seams and water-repellent zips
- Weight and packability in your pack
- Fabric resistance to abrasion
Waterproof clothing for hiking, trail, mountaineering and skiing
The right equipment depends on your activity. For hiking, choose versatile, comfortable clothing; for trail, with ultra-lightweight, packable models that disappear into your pack. Themountaineering requires durable clothing, while ski touring combines waterproofing and protection from snow. The same jacket or pair of trousers can cover several activities, but adapting your equipment to your activity remains key to comfort. Some waterproof models are also suitable for the city or cycling, keeping you dry on everyday journeys.
Caring for waterproof clothing to preserve its waterproofing
A waterproof garment retains its performance when properly cared for. Wash it at a low temperature with suitable technical detergent, without fabric softener, then reactivate its water repellency with a reproofing product. This regular step prevents the fabric from becoming saturated with water and extends the life of the membrane. Find our care products to clean and reproof your jackets and trousers, season after season, and keep your equipment reliable over the long term.