Sea to Summit Spark SPIV Down Sleeping Bag

Out of stock
Only %1 left
Check In Store Availability

The new ultralight Spark™ Series of sleeping bags are designed to keep you as warm as possible while minimising packed weight and size. The expedition-sized Spark SPIV is the warmest in the series. It too combines ULTRA-DRY Down™ 850+ loft premium goose down, light-gauge #3 YKK® zip, high-performance 10D nylon shell and 7D lining fabrics and a contoured mummy shape for efficient insulation and superior performance. Other features include a full box baffle construction to allow for extra down and reduce cold spots, a full-length zip and a draft tube, full hood and neck collar to keep heat in. An expedition weight mid-winter bag.


  • Contoured mummy shape for comfort and efficient insulation
  • Expedition mummy bag sizing provides extra space for layered clothing or extra wriggle room
  • Responsible Down Standard 850+ Loft Premium Goose ULTRA-DRY Down™ for maximum insulation value
  • Ultralight 7D and 10D fabrics for minimal weight and packed size
  • Vertical chest baffles prevent down migration and cold spots
  • Uses a full box baffle construction to accommodate extra down and reduce cold spots
  • Full side zip with two sliders provides easy access and extra ventilation options
  • Zip draft tube, hood and front neck draft collar to prevent warmth being lost when it's needed
  • Includes Ultra-Sil™ Nano Compression Bag for compact storage
  • Note that this bag is not designed to pair with another


Featured Gear Summer Clearance 2024
Fits to 183cm (Regular), 198cm (Long)
Shoulder Width 77cm (Regular), 81cm (Long)
Foot Width 47cm (Regular), 50cm (Long)
Rolled Size ⌀18 x 40cm
Compression 6.6 litres (Regular), 7.7 litres (Long), 10 to 3.3 litres sack volume
Fill ULTRA-DRY Down™ 850+ Loft premium Goose Down (min. 90% down)
Fill Weight 620g (Regular), 700g (Long)
Average Weight 880g (Regular), 985g (Long)
Outer Material 10D nylon
Inner Material 7D nylon
Temperature Rating minus 8°C comfort EN13537 rating woman / minus 15°C Lower comfort EN13537 rating for men

ULTRA-DRY Down™: With the introduction of water-repellent ULTRA-DRY Down™ Seat to Summit have virtually eliminated the negative effects moisture has on down. The ULTRA-DRY Down™ water-repellent treatment protects the down from external moisture and condensation from inside the bag. It is a permanent (no loss of treatment effect has been seen in over 14 wash cycles) Nano-level water repellent polymer treatment applied to Sea to Summit high loft, high quality down. The Nano-thin treatment vastly improves the down's reaction to water without effecting its weight or loft performance. ULTRA-DRY Down™ retains over 60% more loft and absorbs 30% less moisture when compared with untreated down. Sea to Summit sleeping bags dry out 60% faster than bags with untreated down. The Nano-level treatment also inhibits bacterial and microbial growth, which makes Sea to Summit sleeping bags more hygienic and improves their lifespan.

Responsible Down Standard (RDS): The RDS is helping to shift the entire down and feather industry towards more humane animal rearing and handling practices. Overseen by the industry leading Textile Exchange, the RDS requires independent, third party assessments of all aspects of animal rearing and handling throughout the entire supply chain. By only using down that meets the audited requirements of the RDS we can have confidence that each phase of the collection process has been completed with the welfare and ethical treatment of waterfowl in mind. To find out more about how the RDS is improving animal welfare during down collection, please visit (link will open a new window).



Write Your Own Review
You're reviewing:Sea to Summit Spark SPIV Down Sleeping Bag
Your Rating
© 2024 Bivouac Outdoor All Rights Reserved.