Bronze Winner In The Category Mountaineering
The Mammut Eiger Speed Light Down IN Hooded Jacket Men was developed as an emergency insulation layer for fast alpine movement. Built for speed mountaineering and high-intensity alpine use, the jacket focuses on delivering immediate warmth with minimal weight and pack volume — particularly during rapid weather changes or exposed sections in technical terrain.
At the center of the concept is Mammut HexaLoft Pro, a newly developed down-baffle construction designed specifically for ultralight insulation. Instead of relying on standard horizontal stitch-through chambers, the system uses a hexagonal geometry with diagonal pleats to create additional three-dimensional loft inside the construction. This allows the down to expand more efficiently and trap more air without adding extra material weight. According to laboratory testing, Mammut HexaLoft Pro improves thermal resistance by 73% compared to the predecessor’s 3 cm horizontal stitch-through construction at the same down fill weight.
Combined with a 7-denier recycled polyamide shell, 1000-cuin RDS down, and a total weight of just 196 g, the jacket achieves an exceptionally high warmth-to-weight ratio while maintaining compressibility and fast packability. The switch from a half-zip to a full-zip construction further improves handling during rapid transitions in alpine terrain. Mammut received a European Outdoor Award 2026 for this combination of advanced insulation engineering, ultralight construction, and mountaineering-focused functionality.
What convinced the jury:
★ Mammut HexaLoft Pro construction
The new baffle geometry improves thermal efficiency without increasing weight.
★ Exceptional warmth-to-weight ratio
1000-cuin down and a 7D shell combine minimal weight with high thermal performance.
★ Built for fast alpine transitions
The ultralight full-zip construction supports efficient handling in changing conditions.
Jury Statement:
A strong step forward in ultralight insulation: the Mammut HexaLoft Pro construction rethinks stitch-through baffles, achieving higher thermal efficiency without added weight. Designed for speed mountaineering, the jacket delivers reliable emergency warmth, combining packability, performance, and precision in demanding alpine conditions.
Innovation Score:
The Eiger Speed Light Down IN Hooded Jacket Men introduces a new construction approach within the ultralight down segment. Mammut HexaLoft Pro combines a stitch-through construction with hexagonal chambers and diagonal pleats to generate additional three-dimensional loft while maintaining low weight. This approach increases thermal efficiency without relying on heavier side-wall constructions or additional fill material. Together with the 7D recycled shell, 1000-cuin down, and minimalist product architecture, the jacket focuses on maximizing warmth, packability, and usability for high-speed alpine movement.
It features a protective toe cap and a sturdy rubber sole that allows for easy rolling motion when walking. The wavy laces ensure an optimal fit and keep the knot secure. Since children’s feet grow quickly, the removable Reima Happy Fit insoles are marked so parents can easily check the shoe size.
The upper is made from at least 50 percent recycled material. The lining and the insole lining are made from 100 percent recycled polyester. The outsole contains 30 percent recycled rubber, and the shock-absorbing midsole contains 30 percent recycled EVA.
Product Specifications:
- Category: Ultralight alpine insulation jacket
- Construction: Mammut HexaLoft Pro
- Insulation: 1000-cuin RDS down
- Shell Material: 7D recycled polyamide
- Weight: 196 g
- Colors:
- Black
- Alpina
- Hood: Helmet-compatible adjustable hood
- Retail Price: € 480
MammutMammutMammutDesign & Materials
The Eiger Speed Light Down IN Hooded Jacket Men follows a highly reduced construction focused on low weight and rapid deployment during alpine movement. The transition from a half-zip to a full-zip design improves usability during fast layering changes, while the minimalist pocket setup keeps bulk to a minimum.
At the core of the jacket is Mammut HexaLoft Pro. The hexagonal chamber geometry with diagonal pleats creates additional loft within a stitch-through construction, enabling the down to expand more efficiently and trap more air. Combined with premium 1000-cuin RDS down and an ultralight 7D recycled shell material, the result is a highly compressible insulation layer engineered for maximum thermal efficiency at minimal weight.
Intended Usage
The Mammut Eiger Speed Light Down IN Hooded Jacket Men was developed as an emergency insulation layer for speed mountaineering and fast alpine missions. It targets performance-oriented alpinists and mountain athletes moving quickly through technical terrain who require immediate warmth without carrying unnecessary weight. The jacket is particularly suited to summit pushes, exposed ridgelines, alpine traverses, and FKT-focused mountain efforts where packability, thermal efficiency, and fast transitions are essential.
