Details Sea to Summit Spark SpIV Down Sleeping Bag When you need a performance sleeping bag but don’t want to be weighed down, you should take a look at Sea to Summit's Spark™ Series ultra light down sleeping bags. Designed to balance as much warmth as warm as possible with minimal packed weight and size, the Spark SpIV uses a superlight 10D nylon shell stuffed with 620g RDS 850+ loft, dry-treated premium goose down in a full box baffle construction. A light-gauge #5 YKK zip and high performance 10D Nylon shell and 7D lining fabrics, are combined with a contoured mummy design for efficient insulation. Weight: 880 g Temperature rating: EN -8°c Comfort to -15°c Lower limit Max user height: 183 cm Width (shoulder): 76.5 cm Width (footbox): 47 cm Expedition mummy shape 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 YKK #5 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 C0 Non-PFC Water Repellent Finish 100% RDS Down Specifications Spark SPIV Down Sleeping Bag