Robens Spire II -4°C Sleeping Bag | Lightweight 3-Season Mummy Bag

Enhanced Warmth for Cooler Three-Season Adventures The Robens Spire II -4°C Sleeping Bag is designed for campers, backpackers, and trekkers who need extra warmth when temperatures begin to drop. Featuring Robens' OneThermo® synthetic insulation, a heat-efficient body-contoured shape, and a range of cold-weather features, the Spire II delivers reliable performance across spring, autumn, and mild winter conditions. A 3D hood, redesigned neck baffle, and insulated zip baffle work together to minimise heat loss, while the innovative shark fin foot box provides additional insulation where it's needed most. Why You'll Love It Increased Warmth for Colder Nights → Limit rating of -4°C for cooler conditions Excellent Warmth-to-Weight Ratio → Body-contoured mummy design maximises thermal efficiency Performs When Damp → Synthetic insulation continues to insulate in humid and wet conditions Comfort-Focused Design → Soft brushed lining improves comfort and moisture management Adventure Ready → Compression sack included for compact packing OneThermo® Synthetic Insulation The Spire II uses OneThermo® insulation, providing: Reliable warmth in cooler temperatures Good loft retention Fast drying performance Effective insulation in damp conditions Long-lasting durability for regular outdoor use Ideal for UK camping, trekking, backpacking, and shoulder-season adventures. Temperature Ratings Comfort: 2°C Limit: -4°C Suitable for: Spring camping Autumn adventures Mountain camps Backpacking trips Cool-weather wild camping Key Features 3D Hood Profile → Enhanced warmth around the head and neck Redesigned Neck Baffle → Minimises heat loss and cold draughts Differentiated Hood Drawcords → Easy adjustment in darkness Shark Fin Foot Box → Additional insulation around the feet Full-Length Insulated Zip Baffle → Prevents cold spots along the zip YKK Auto Lock Two-Way Zip → Reliable operation and flexible ventilation Anti-Snag Zip Guard → Smooth opening and closing Brushed Polyester Lining → Soft-touch comfort with excellent moisture transport Internal Pocket → Secure storage for valuables Compression Stuff Sack Included Hanging Loops for Drying & Storage PFAS-Free Construction Specifications Weight: 1599g Packed Size: 33 × 23 cm Shell Fabric: 50D 300T Polyester Taffeta Insulation: OneThermo® Lining: 230T Microfibre Polyester Zip: YKK Auto Lock Two-Way Zip Materials: Shell: 100% Polyester Lining: 100% Polyester Filling: 100% Polyester Perfect For Camping Backpacking Trekking Wild Camping Bikepacking DofE Expeditions Cool-Weather Adventures