Master the cold with The Ascent 900. Specifically engineered for winter expeditions and high-altitude bivouacs, this high-performance sleeping bag offers exceptional warmth and resilience. Wrapped in a durable, wind-resistant shell and filled with specialized hydrophobic down, it ensures a sanctuary of heat even in damp, freezing environments. Its refined Crimson Red aesthetic and wide mummy fit provide the perfect balance between technical protection and restorative comfort.
Thermal Engineering & Materials ↓
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Hydrophobic Insulation: Filled with 900g of premium duck down, treated with a fluorocarbon-free finish to maintain loft and warmth in wet conditions.
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Pertex Shell: Encased in high-tenacity recycled Pertex Quantum fabric, providing a windproof and water-resistant barrier against the elements.
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Trapezoidal Baffles: Advanced internal chamber construction prevents down migration and eliminates cold spots for consistent thermal performance.
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Temperature Rating: Laboratory-tested for a comfort limit of -18°C (0°F), designed for extreme winter environments.
Dimensions & Technical Metrics ↓
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Weight: 1530 g (54 oz) for the bag itself, plus a 170 g compression sack for transit.
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Silhouette: A wide mummy-cut design that allows for natural sleep positions without sacrificing thermal efficiency.
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Internal Length: Optimised to accommodate explorers up to 185 cm in height.
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Zipper Interface: Left-side 3/4 length main zipper with an anti-snag bonded guard and an insulated draft tube.
Logistics & Comfort Features ↓
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Internal Storage: Discrete zippered pocket for keeping electronics or navigation tools warm and operational.
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Angled Footbox: Anatomically designed to allow your feet to rest in a relaxed position while maintaining maximum heat.
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Adjustable Draft Collar: A 3D-shaped neck collar that can be cinched to trap heat inside the core.
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Maintenance: Clean using technical down wash and tumble dry on low with specialized dryer balls to restore the 650FP loft.
The Presentation ↓
The Ascent 900 arrives in our signature protective packaging, curated to preserve the integrity of the hydrophobic down until your first winter departure.
- The Ascent 900 Signature Sleeping Bag
- High-Density Compression Stuff Sack
- Breathable Cotton Storage Bag for home maintenance
