W-Series Waterproof Shell Pants
When conditions get tough, you need maximum protection, and that's where the W-Series Waterproof Shell Pants help you perform at your best. These lightweight 3-layer waterproof/breathable technical pants are designed for FAST&LIGHT alpinism. Crafted with the eVent® DVStorm™ 3-layer membrane, they provide exceptional protection with 20,000 mm water column waterproofing and 30,000 g/m²/24h MVTR breathability, keeping you dry and comfortable during high-intensity activities.
It features a wide, waterproof YKK™ AquaGuard® side zipper with a double slider, allowing for quick access with boots and ventilation of the leg during intense activities.
Its fully taped seams and a highly durable Kevlar fabric on the hem are standout features. Its ultralight construction and excellent weather protection make the W-Series Waterproof Shell Pants ideal for FAST&LIGHT activities. Pair it with other items from the W-Series collection (perfect over the W-Series Meteor Insulated pants) and discover the lightest and most functional way to tackle the mountains.
FAST&LIGHT - 317 g. (S)
W-Series Waterproof Shell Pants
When conditions get tough, you need maximum protection, and that's where the W-Series Waterproof Shell Pants help you perform at your best. These lightweight 3-layer waterproof/breathable technical pants are designed for FAST&LIGHT alpinism. Crafted with the eVent® DVStorm™ 3-layer membrane, they provide exceptional protection with 20,000 mm water column waterproofing and 30,000 g/m²/24h MVTR breathability, keeping you dry and comfortable during high-intensity activities.
It features a wide, waterproof YKK™ AquaGuard® side zipper with a double slider, allowing for quick access with boots and ventilation of the leg during intense activities.
Its fully taped seams and a highly durable Kevlar fabric on the hem are standout features. Its ultralight construction and excellent weather protection make the W-Series Waterproof Shell Pants ideal for FAST&LIGHT activities. Pair it with other items from the W-Series collection (perfect over the W-Series Meteor Insulated pants) and discover the lightest and most functional way to tackle the mountains.
FAST&LIGHT - 317 g. (S)
"This pant is the perfect combination of lightness and durability for mountain activities. Primarily designed for mountaineering and ski touring, it is also suitable for disciplines such as trail running in cold, snowy, and windy conditions, or paragliding. Its practical design allows for easy transport in a backpack and quick donning in snowy or windy areas, thanks to its long side zippers. Additionally, it offers protection against crampon abrasion and features an elastic cord at the hem to keep it snug under the boot, ensuring comfort and functionality when breaking trail or facing demanding terrain."
Jonatan Garcia
Equipment
Full side zippers with double YKK™ AquaGuard® sliders
Highly resistant lower fabric against cuts
Waterproof YKK™ zipper fly with easy-grip puller
Elastic waistband with elastic band and pull tab
Pre-shaped knees
Elastic band to pass under the boot (adjustable and replaceable) to prevent the pant from riding up
Top Layer Fit: designed cut to be worn as a third layer
Weight
Size S: 317 grams
Size M: 333 grams
Size L: 351 grams
Size XL: 368 grams
Fabric
eVent® DVStorm™ 3-Layer
Waterproof, breathable, and 100% windproof. 100% nylon fabric, 20 deniers, 90g/m².
Waterproofness: 20,000mm water column (ISO811)
Breathability: 30,000g/(m²·24h) (JIS L 1099 B2)
Air permeability: 0.207 cfm (ASTM D737)
DWR (Durable Water Repellency, PFC Free) treatment repels rain and snow, protecting the membrane from water saturation and enhancing its breathability.
Important: Avoid using deodorants, makeup, or sunscreen in direct contact with the membrane, as these can contaminate it and cause irreversible damage.
The main difference between eVent® DVStorm technology and other waterproof/breathable fabrics on the market lies in the billions of microscopic pores embedded in our proprietary membrane. These pores begin to work instantly as the sweat vapor generated by physical activity starts to accumulate inside your clothing or footwear.
This technology is called Direct Ventilation, and unlike other technologies, it doesn’t require any external activation to begin breathing. It is a “dry” system that allows eVent membranes to be fully waterproof and breathable, keeping you dry and comfortable across a wide range of temperatures and conditions.
OS2O is the pioneering brand in Spain using eVent® membranes.
Sizes
Maintenance
Information about care and maintenance
