Helium 300 4 to -1C Down Sleeping Bag Right Hand Zip 2026

Description The Mont Helium 300 is an exceptionally lightweight and compact down sleeping bag designed for cool-weather, three-season camping. Weighing just 680 g in the Standard size, it provides an outstanding warmth-to-weight ratio for bushwalking, hiking and lightweight adventures where keeping pack weight and bulk to a minimum is a priority. Filled with premium 850+ loft Muscovy down, the Helium 300 delivers high-loft insulation in an impressively compact package. The down features a DWR Loft treatment to improve resilience and maintain warmth in damp conditions, while the lightweight 10D nylon outer and lining help minimise overall weight. The sleeping bag uses a tapered rectangular shape that balances thermal efficiency with useful room to move. Vertical torso baffles and Mont's Radial Arc Baffle System help maintain even down distribution and maximise loft, while the differential cut reduces compression of the insulation and helps minimise cold spots. A contoured hood and down-filled 3D draft tube help retain warmth, while the full-length YKK® side zip with dual sliders and separate foot zip provide flexible ventilation. With a packed size of approximately 16 × 33 cm, the Helium 300 is an excellent choice for lightweight three-season adventures where every gram counts. Mont Helium 300 Down Sleeping Bag Features Exceptionally lightweight and compact three-season down sleeping bag Designed for cool-weather bushwalking, hiking and lightweight camping 850+ loft Muscovy down provides excellent warmth for minimal weight DWR Loft-treated down provides greater resilience and improved warmth in damp conditions Durable 10D × 10D nylon shell and lining weighing just 26 g/m² Hot-rolled cire treatment helps prevent down leakage and increases durability Tapered rectangular shape balances warmth with freedom of movement Vertical torso baffles help maintain even down distribution Radial Arc Baffle System helps maximise loft and thermal efficiency Differential cut reduces insulation compression and helps minimise cold spots Contoured hood helps retain warmth around the head Down-filled 3D draft tube helps prevent heat loss through the zip Full-length YKK® side zip with dual sliders provides ventilation and easy access Separate foot zip provides additional ventilation Available in Women's/Small, Standard and Extra Large sizes Standard size available with left or right zip options Highly compact design is ideal for lightweight and fast-moving adventures Specifications Intended Use Bushwalking, Hiking, Lightweight Camping Season Rating 3 Season Women's / Cold Sleeper Rating 4°C Men's / Warm Sleeper Rating -1°C Insulation 850+ Loft Muscovy Down Down Treatment DWR Loft Water-Resistant Treatment Shell Fabric 10D × 10D Nylon, 520 Thread Count Fabric Weight 26 g/m² Standard Weight 680 g Maximum User Height – Women's/Small 170 cm Maximum User Height – Standard 185 cm Maximum User Height – Extra Large 200 cm Shoulder Circumference – Women's/Small 160 cm Shoulder Circumference – Standard 160 cm Shoulder Circumference – Extra Large 170 cm Hip Circumference – Women's/Small 132 cm Hip Circumference – Standard 132 cm Hip Circumference – Extra Large 142.5 cm Foot Circumference – Women's/Small 115.5 cm Foot Circumference – Standard 115.5 cm Foot Circumference – Extra Large 121 cm Packed Size Approximately 16 × 33 cm Zip Configuration Full-Length Side Zip with Dual Sliders and Separate Foot Zip Zip Options Women's Left Zip; Standard Left or Right Zip; XL Left Zip Best Use Three-Season Bushwalking, Hiking, Lightweight Camping and Fastpacking