A warm, protective but relatively lightweight down insulated jacket that is designed for uncompromisingly fast and light mountaineering goals. The Sigma sits amongst our highest specification down jackets for the most demanding users.

The Sigma, and its direct men’s equivalent the Vega, remain leading lights in Alpinism. They’re jackets that have been used everywhere from the first ascent of Latok I from the North to Denali’s Cassin Ridge and the hard winter classics of the Alps. Balancing on the fine line between absolute warmth and the minimal packsize that makes the cut on hard routes, they’re critical kit for experienced climbers.

800 fill power European Goose down is strategically distributed through the jacket and held in place by the stitched-through baffle construction, optimising warmth and preventing down migration that can lead to cold spots, particularly in vulnerable areas such as the shoulders, chest and hood. All of our down is minimally treated and DOWN CODEX® approved, meaning it’s sourced through a carefully audited supply chain.

Lightweight and highly water resistant DRILITE® Loft outer fabric allows the down to loft to its full potential, providing maximum warmth while protecting it against melting snow, ice and pouring spindrift. DRILITE® Loft also offers complete wind resistance and excellent breathability, keeping you warm and comfortable even when working hard. This protective outer fabric also extends around the inner hem and the hood lining, protecting you and the jacket inner from moisture ingress in these typically vulnerable areas. Meanwhile, seam-free shoulder panels improve water resistance even when wearing a pack.

The grown-on insulated hood uses our patent-pending Firestorm construction, combining a sewn-through baffle structure with a drop outer fabric to provide an invaluable defence against the elements in serious conditions. Baffle pleats reduce the overall volume without compromising warmth, and a pleated halo baffle around the face offers reassuring warmth and protection against freezing winds and spindrift.

Features

Windproof, Breathable and Water Resistant; DRILITE® Loft outer fabric keeps you protected and comfortable

European Goose Down insulation; Exceptional warmth to weight ratio, highly compressible and durable

Stitched-through baffles – some with pleated finish improves loft and increases thermal efficiency

Our Mountain HC Insulated Hood is fully adjustable with rear volume adjustment and two frontal adjusters and can be worn with a climbing helmet.

Hybrid Hood Construction: The outer shell provides a protective envelope, improving the efficiency of the insulation layer underneath

2 outer hand pockets, positioned to be accessible when carrying a pack or wearing a climbing harness and large enough to store gloves etc.

2 Inner stretch mesh pockets for stashing gloves or accessories

Packs away into small stuff-sack (included)

Built to last. Backed up by our Product Lifetime Guarantee.