Polartec® Alpha®

Onwards and upwards, the summit is not far off. Your breath forms in clouds that are quickly blown away by the cold wind. A quick rest, have a drink, and then push on. Intensive stop-and-go activities in sub-zero conditions pose a particular challenge for functional fabrics. They have to strike the right balance between trapping an insulating layer of air next to your body and allowing moisture/sweat to quickly escape. This is where Polartec® Alpha® active insulation is in a class of its own. It regulates core body temperatures during both dynamic and static activities by retaining body heat, but allowing moisture vapour to move freely through the fabric, increasing overall air exchange and speeding up dry times. This prevents the fleecy insulation from turning into a sponge. It’s made of fine synthetic fibres between air permeable woven layers with a core of lofted knit fibres to ensure uniform consistency. And the outer layer is given a DWR (durable water repellent) finish. As a result, you get a compressible and breathable insulation fabric that provides warmth without weight. And that works well with a wide range of outer and lining fabrics or as part of a layering system. This is why SALEWA® uses Polartec® Alpha® in particular to make jackets and pants for mountain sports such as ski touring, speed hiking and mountain training in cold conditions.


  • highly breathable
  • good heat retention
  • very lightweight and packable
  • fast drying
  • easy care


  • abrasion-resistant and robust
  • unrestricted freedom of movement
    due to 2-way and 4-way stretch
  • highly breathable
  • lightweight
  • available with high UV protection
  • many versions bluesign® certified