Sea to Summit Spark SP4 Sleeping Bag

15 - 15% OFF

$719.00$759.00 inc GST.

The Sea to Summit Spark SP4 Sleeping Bag is constructed with Ultralight 7D and 10D fabrics and filled with RDS 850+ Loft Premium Goose Down.

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Ultra-light and technical, our Spark™ Series 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.

Our 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 bag, where every gram is counted and down has never been a viable option.

  • Ultralight 7D and 10D fabrics for minimal weight and packed size
  • RDS 850+ Loft Premium Goose ULTRA-DRY Down™ for maximum insulation value
  • Contoured mummy shape for comfort and efficient insulation
  • Vertical chest baffles prevent down migration and cold spots
  • Uses a full box baffle construction to accommodate extra down and reduce cold spots
  • Expedition mummy bag sizing provides extra space for layered clothing or extra wriggle room
  • Vertical baffles on chest optimises positions of down to prevent it moving during use
  • Full side 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
  • EN13537 Temperature Rating Comfort: -8°C | 18°F
  • EN13537 Temperature Rating Lower Limit: -15°C | 5°F
  • EN13537 Temperature Rating Extreme: -36°C | -33°F
  • Compression Sack Size: Small 10L TO 3.3L
  • Dimensions:
    • Regular: 212cm x 83cm
    • Long: 227cm x 89cm
  • Fill Weight:
    • Regular: 620 Grams
    • Long: 700 Grams
  • Internal Chest Circumference:
    • Regular: 155cm
    • Long: 162cm
  • Internal Hip Circumference:
    • Regular: 135cm
    • Long: 142cm
  • Recommended User Height:
    • Regular: Up to 183cm
    • Long: Up to 198cm
  • Weight:
    • Regular: 880g
    • Long: 985g

Additional information

Weight N/A
Dimensions N/A

Sea to Summit

Fill Wight

620g, 700g


880g, 985g

Temperature Rating Comfort

-8°C, 18°F

Temperature Rating Lower Limit

-15°C, 5°F

Temperature Rating Extreme

-36°C, -33°F


Regular, Long


Sea to Summit

Sea to Summit is an innovative design and product development company that engineers a wide range of intuitively simple products that help make time in the outdoors fun, efficient and comfortable. From our West Australian base, Sea to Summit has grown into an award-winning global brand sold in more than 60 countries. Significant growth and international recognition has strengthened our original ethos ‘to equip and inspire’ and it continues to drive our research and development of the best materials and production methods. It inspires new product innovations that keep us at the forefront of bringing lighter, better made, better performing gear to outdoor enthusiasts around the world.


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