The Sea to Summit Spark Sp0 Down Sleeping Bag is currently exclusively available in the UK here at Ultralight Outdoor Gear.

UOG TOP PICK - Sea to Summit Spark Series Sleeping Bags - Best Warmth to Weight ratio - We've singled out Sea to Summits Spark sleeping bags as one of our recommendations because its a minimalist in the true sense of the word, it only includes a few key features but delivers exceptional warmth given its very low weight.

Sea to Summit says:

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 a 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 Ultra-Dry 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.

Sea to Summit's Spark Sp0 Down Sleeping Bag is a true minimalist bag that uses the lightest materials and highest quality, responsibly sourced down to deliver an exceptionally high warmth to weight ratio, when compared to other similarly rated bags. Best used in the Summer or as a liner to boost performance of another bag.

The Spark 0 bag features vertical baffles on the chest area to minimise movement of down, optimising insulation where you need it most. The half zip saves weight and reduces heat loss at the expense of venting if conditions are too warm.

The contoured mummy shape isn't too constrictive and the super thin and light outer fabrics means more care will be needed than with more heavy duty bags. The bag compresses down to a very small size.

- Reviewed by Ultralight Outdoor Gear

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UOG TOP PICK - Sea to Summit Spark Series Sleeping Bags - Best Warmth to Weight ratio - We've singled out Sea to Summits Spark sleeping bags as one of our recommendations because its a minimalist in the true sense of the word, it only includes a few key features but delivers exceptional warmth given its very low weight.