The Robens Spire II -4°C Sleeping Bag is a synthetic mummy bag with OneThermo® insulation, a 2°C comfort rating and a -4°C limit, for campers, backpackers and trekkers who need a bit more warmth when the temperature starts to drop. It covers spring, autumn and mild winter conditions.

This is the Spire for cooler three-season nights. OneThermo® synthetic insulation keeps insulating in humid and wet conditions, dries quickly and holds its loft through regular use. The body-contoured shape is heat-efficient, and a 3D hood, redesigned neck baffle, insulated zip baffle and shark fin foot box work together to minimise heat loss where you feel it most. The brushed lining is soft and moves moisture away from your skin. It weighs 1599g and packs to 33 x 23cm in the supplied compression sack.

Why you'll love it

• Warmer for cooler nights – comfort rated to 2°C with a -4°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 2°C, limit -4°C
• Weight: 1599g; packed size: 33 × 23cm
• 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 heading out on spring and autumn trips, mountain camps and cool-weather wild camping, including DofE expeditions. Suits all levels.