Box wall construction - Down filling is contained in box shaped baffles for maximum loft and to maintain an even distribution of down from head to toeInsulite™ Fusion - Hybrid filling: 70% 90/10 700FP Hydro-Barrier down, 30% 4T synthetic insulation. The interlinked lattice supports the down and achieves superior loft, even in damp conditions4T synthetic insulation - Innovative synthetic insulation fibre. Improves warmth to weight ratio by trapping air in its patented channel structureHydro-barrier down - Premium 90/10 700 fill power duck down stays drier four times longer than untreated downEthically sourced down - Humanely collected down from birds that have not been subject to any unnecessary harmPolair Ascent – The mini ripstop 30D, 40g/m², nylon fabric is durable and water resistant. This protects the down from the elements giving the bag longevity and full performance.Insulated, adjustable shoulder baffle - Retains heat within the sleeping bag3D hood with multi-cord closure - Structured hood design keeps the head and shoulders warmer during the night. The hood's dual cord thicknesses allow easy adjustment in the darkArrow Foot - Shaped foot area allowing feet to relax into their natural position3D insulated zip baffle - Minimises heat loss through the zip. The 3D shape allows the filling to loft and provide insulationFull Length Two-Way Auto-Lock Zip with Zip Guard: Used to seal in warmth or provide ventilation and can be used from inside the bag. Anti-catch piping helps to prevent the zip from snagging on the lining.Internal pocket - Provides convenient storage for small itemsOmega shaping - Engineered to position zips and seams in the lower section of the bag. Ergonomically shaped to fit around head and shoulders for improved heat retentionRoll top dry bag - Expel excess air and roll 3 times for a sealed, water tight bagTemperature ratings independently measured in accordance with EN 13537:2012 - Extensively tested to meet accurate temperature rating standards2 Year WarrantySpecifications