Sea to Summit Spark SpIV

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More Information
Insulation Down
Comfort temperature -10° / 0°
Weight 750 - 1000g

Quick overview

Ultra-light and technical, the Sea to Summit Spark™ Series sleeping bags are designed to keep you as warm as possible while minimising packed weight and size.

The Spark™ Series spans everything from an ultralight liner to an expedition weight mid-winter bag. While the end usage is very different, they reflect a design ethos of matching weather conditions to the lightest bag possible.

The secret to the impressive performance is a combination of premium materials and careful design. The RDS 850+ Loft premium goose down, light-gauge #3 YKK zip and high performance 10D Nylon shell and 7D lining fabrics, set the stage for superior performance. These materials are combined with a contoured mummy design for efficient insulation, and that mummy design is then tweaked for each model to best fit the use scenario.

ULTRA-DRY Down™ water-repellent treatment protects the down from external moisture and condensation from the inside of the bag, virtually eliminating the negative effects moisture has on down. All Sea to Summit Down Sleeping Bags use Responsible Down Standard (RDS) certified down. The ULTRADRY Down™ protection also makes the Spark™ an impressive hard-alpine or adventure racing sleeping bag, where every gram is counted and down has never been a viable option.


Sea to Summit Spark Sp4 R L
Comfort °C -8 °C -8 °C
Limit °C -15 °C -15 °C
Extreme °C -36 °C -36 °C
Fill weight 620 700
Weight (grams) 880 985
Insulation material ULTRA-DRY Down® 850+ Loft ULTRA-DRY Down® 850+ Loft
Up to bodysize <183 cm <198 cm
Shoulder- / Hip- / Footwidth (cm) 155 - 135 - 94 cm 162 - 142 - 100 cm
Compressed Volume 6 L  
Shape Mummy Mummy
Intended use Globe-trotting adventures Globe-trotting adventures


  • Ultralight 7D and 10D fabrics for minimal weight and packed size
  • RDS 850+ Loft Premium Goose ULTRA-DRY Down™ for maximum insulation value
  • Expedition mummy bag sizing provides extra space for for layered clothing or extra wriggle room
  • Uses a full H-box baffle construction to accommodate extra down and reduce cold spots
  • Vertical baffles on chest optimises positions of down to prevent it moving during use
  • Full zip with two sliders provides easy access and extra ventilation options
  • Zipper draft tube, hood and front neck draft collar to prevent warmth being lost when it’s needed
  • Includes lightweight Ultra-Sil™ Nano compression bag for compact storage


  • Shell: 100% Nylon
  • Lining: 100% Nylon
  • Primary Filling Material: GOOSE DOWN (Min. 90% Down)
  • Stuffsack: 100% Nylon excluding Trims