The Robens Spire I -1°C Sleeping Bag is a three-season synthetic mummy bag with OneThermo® insulation, a 4°C comfort rating and a -1°C limit, for camping, trekking and backpacking from spring through autumn. A dependable first proper sleeping bag, and a sensible one for anyone who camps in the damp British hills.

Synthetic insulation is the honest choice for UK conditions: OneThermo® keeps working when it's been exposed to condensation, dries fast and holds its loft through regular use. The body-contoured mummy shape cuts the dead space you'd otherwise have to heat, and a 3D hood, redesigned neck baffle and full-length insulated zip baffle close off the usual escape routes for warm air. Inside, the brushed lining feels soft and moves moisture away from you. It weighs 1450g and packs to 30 x 22cm in the supplied compression sack.

Why you'll love it

• Three-season warmth – comfort rated to 4°C with a -1°C limit
• Works when damp – OneThermo® synthetic insulation keeps insulating in moisture and condensation, with good loft retention and fast drying
• Heat-efficient shape – body-contoured mummy design cuts dead air space; 3D hood and redesigned neck baffle keep draughts out
• No cold spots – full-length insulated zip baffle, shark fin foot box and anti-snag zip guard
• Soft inside – brushed polyester lining with excellent moisture transport
• Easy in the dark – differentiated hood drawcords you can adjust by touch

Good to know

• Temperature ratings: comfort 4°C, limit -1°C
• Weight: 1450g; packed size: 30 × 22cm
• Shell: 50D 300T polyester taffeta; lining: 230T microfibre polyester; insulation: OneThermo®
• Materials: shell, lining and filling 100% polyester
• Zip: YKK Auto Lock two-way zip
• Colour: Black / Grey
• Internal valuables pocket, hanging loops for drying and storage, PFAS-free construction
• Included: compression stuff sack

Who it's for

Campers, backpackers, trekkers and bikepackers who want a three-season bag for spring camping, summer mountain nights and autumn trips in cooler UK conditions, including DofE expeditions and wild camping. Suits all levels.