Sea to Summit Spark −1°C Down Sleeping Bag

The Sea to Summit Spark −1°C Sleeping Bag delivers an excellent balance of warmth, weight and packability for lightweight three-season adventures.

Premium 850+ fill-power goose down provides efficient insulation without unnecessary bulk, while the performance mummy shape, technical hood and draft protection help retain warmth. Weighing approximately 493g in Regular, it is ideal for tramping, bikepacking and fast-and-light trips.

Key Features

• Premium 850+ fill-power, RDS-certified goose down

• Ultra-Dry Down treatment helps protect the insulation from moisture

• ISO lower-limit temperature rating of −1°C

• ISO comfort temperature rating of 4°C

• Lightweight mummy shape improves thermal efficiency

• Technical hood and draft collar help retain body heat

• Half-length zip reduces weight and heat loss

• Lightweight 10D nylon shell and lining

• Highly compressible for space-conscious packing

• Includes a compression sack and storage cell

Who Is It For?

The Spark −1°C is ideal for hikers, trampers and bikepackers wanting an ultralight sleeping bag for three-season use, hut trips and milder shoulder-season adventures.

Specifications

• Lower limit: −1°C

• Comfort rating: 4°C

• Insulation: 850+ fill-power goose down

• Down fill weight: Approximately 280g in Regular

• Down certification: Responsible Down Standard

• Shape: Performance mummy

• Weight: Approximately 493g in Regular

• Maximum user height: Regular 183cm; Long 198cm

• Zip: Half-length

• Included: Compression sack and storage cell

Important Temperature Information

The −1°C figure is the bag’s ISO lower-limit rating. Cold sleepers and those looking for a more comfortable night should use the 4°C comfort rating when selecting their sleeping bag.