Active Insulation is a term used to describe clothing layers that keep you warm but allow moisture/sweat to escape. These are the ideal mid-layers to be worn when slogging (and sweating) your way uphill in cool weather and can usually be used as your outer layer too for long glacier approaches.
Polartec® Alpha® is the most commonly used fabric in this category and was originally developed for U.S. Special Forces who required a more advanced insulating material in their combat uniforms. This fabric is a new technology with active insulation that regulates core body temperatures during both dynamic and static activities. It helps eliminate the need to shed or add layers while on the move, something that can be difficult to do on steep terrain and which in any case spoils the momentum of your approach. Pit-zips etc have traditionally helped to balance airflow and warmth, but are not ideal as they do not work all over and they leave surface areas exposed to the elements in the process.
A lightweight insulated waistcoat.
Lightweight, breathable and quick-drying technical fleece pullover.
A lightweight, breathable and quick-drying fleece for high-exertion activities in the cold.
Lightweight, breathable and quick-drying technical fleece.
A very light, hybrid, highly breathable hooded mid-layer.
A very light, hybrid, highly breathable hooded mid-layer for fast moving alpinists and ski-mountaineers.
The Xenair Light Jacket has zoned areas of uninsulated panels to aid thermoregulation.
Highly breathable insulation that excels during stop start activities.
Active insulation for varied mountain conditions.
Super breathable, lightweight and stretchy hoody.
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