The Sigma jacket continues to be a leading light for mountaineering. The latest version of this modern classic now combines Super Alpine performance with reliable, timeless functionality.

Lightweight, packable and highly water resistant, the Sigma is a high-performance down jacket that keeps you warm and protected during serious mountaineering and mountaineering endeavors where only the essentials make the cut. On multi-day expeditions among the giants of the world's high mountains, or on technical lines in solitary alpine circuses, it provides the warmth you need, without the weight and bulk you don't have.

800 fill goose down is strategically distributed throughout the jacket and held in place by sewn-in baffle construction, optimizing warmth and preventing down migration which can cause cold spots, especially in vulnerable areas such as the shoulders, chest and hood. All our down is minimally treated and DOWN CODEX approved, meaning it is sourced through a transparent and carefully audited supply chain.

The lightweight, highly water-resistant Drilite Loft shell fabric allows the down to shed to its full potential, providing maximum warmth while protecting against snow melt and the howls. Drilite Loft also offers complete wind resistance and excellent breathability, keeping you warm and comfortable even when you work hard. We've also extended this protective outer fabric around the inner hem and hood lining, protecting you and the interior of the jacket from moisture entering these typically vulnerable areas. Meanwhile, seamless shoulder panels improve water resistance even when wearing a backpack.

Lightweight, warm and highly compressible, the Sigma is perfect for fast-paced alpinists, mountaineers and skiers who can't afford to compromise on weight, warmth or pack size.

• ConstructionFIRESTORM Hybrid construction (hood only)
• Materials: Exterior: DRILITE® Loft 30D / 53g. 100% Polyamide with DTY yarns and microporous PU coating
• Lining: 20D /37 g. 100% Recycled Polyamide.
• Filling: European 800 fill 90-10 Goose Down (201g Size 12)
• Hand pockets - DRILITE® Loft
• Interior pockets - Elastic mesh
• Mountain HC insulated hood with HALO Baffle, Duraflex® internal cord locks, back tab volume adjuster and DRILITE® Loft
• Preformed sleeves and elastic cuff with velcro closure®
• Center front: YKK® #5 VISLON® with 2-way anti-lock slider
• Pockets: YKK® zipper #3 VISLON® with anti-lock slider