The Robens Spire III -9°C Sleeping Bag is the warmest bag in the Spire range: a synthetic mummy bag with OneThermo® insulation, a -3°C comfort rating and a -9°C limit, for winter camping, mountain adventures and shoulder-season trips. Built to keep you comfortable when temperatures drop well below freezing.

When you're camping in cold, damp conditions, synthetic insulation earns its place: OneThermo® holds its warmth in condensation and humid environments, dries fast and keeps its loft through frequent use. The body-contoured profile minimises dead air space, and a 3D hood, redesigned neck baffle, insulated zip baffle and insulated shark fin foot box trap heat and cut cold spots. The brushed lining is soft with excellent moisture transport. It weighs 1685g and packs to 36 x 24cm in the supplied compression sack.

Why you'll love it

• Warmest in the range – comfort rated to -3°C and limit rated to -9°C
• 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 -3°C, limit -9°C
• Weight: 1685g; packed size: 36 × 24cm
• 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 / Blue / Navy
• Internal valuables pocket, hanging loops for drying and storage, PFAS-free construction
• Included: compression stuff sack
• Spire range: Spire I -1°C is the lightweight and compact option, Spire II -4°C the versatile all-rounder, Spire III -9°C the choice for warmth and protection

Who it's for

Winter and cold-weather campers, backpackers, trekkers and bikepackers on mountain expeditions, late autumn and early spring trips and exposed wild camps. Suits all levels.