The Sigma Jacket remains a leading light for alpine climbing. The latest version of this modern classic now combines Super Alpine performance with timeless, reliable 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 alpine endeavors where only the essentials make the cut. On multi-day expeditions among the world's high mountain giants, or on technical lines in lonely alpine cirques, it provides the warmth you need, without the weight and bulk you don't.

 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 that can lead to cold spots, especially in vulnerable areas like the shoulders, chest and hood. All of our down is minimally treated and DOWN CODEX approved, meaning it's sourced through a transparent and carefully audited supply chain.

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

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.

• FIRESTORM Construction Hybrid Construction (Hood Only)
• Materials: Shell: DRILITE® Loft 30D / 53g. 100% Polyamide with DTY yarns and microporous PU coating
• Lining: 20D / 37 g. 100% Recycled Polyamide.
• Fill: European 800 fill 90-10 Goose Down (201g Size 12)
• Handwarmer pockets - DRILITE® Loft anti-snag backing
• Interior pockets - Stretch mesh
• Mountain HC insulated hood with HALO Baffle, Duraflex® internal cord locks, back tab volume adjuster, and DRILITE® Loft wick-resistant liner
• Pre-shaped sleeves and elastic cuff with Velcro® closure
• Center front: YKK® #5 VISLON® zipper with 2-way anti-block slider
• Pockets: YKK® #3 VISLON® zipper with anti-block slider
• Approximate weight 580g.