Warm, breathable and ultralight, the Proton is not your typical "puffy pant". Designed to work as an insulating mid-layer on super-cold climbs and hikes, it also works on its own in cool, dry conditions. The combination of durable nylon shell fabric and low profile, air-permeable insulation result in an insulating layer that weighs about the same as a pair of thermal long johns.
- Face fabric is breathable, water-resistant 40-denier nylon
- Breathable synthetic insulation keeps you warm and comfortable while on the move
- Comfortable elasticized waistband
- Zippered, laminated thigh pocket
