SEA TO SUMMIT Spark SpIV - Regular Sleeping Bag

Our Spark™ Series bags is what you reach for when you need a high performance sleeping bag but don’t want to be weighed down by one.
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.
FEATURES
Ultra-light and technical, our Spark™ Series bags are designed to keep you as warm as possible while minimising packed weight and size.
Contoured mummy shape for efficient insulation
Expedition mummy bag sizing provides extra space for layered clothing or extra wriggle room
Updated sizing provides extra room for both shoulders and hips while still maintaining insulation efficiency
Includes lightweight Ultra-Sil™ Nano compression bag for compact storage
SPECIFICATIONS
Regular
Long
Recommended User Height
up to 183 CM
up to 198 CM
Packed dimensions
ø18 x 40 CM
ø18 x 40 CM
Volume Compressed
6.6 L
7.7 L
Compression sack volume (compressed)
10 to 3.3 L
10 to 3.3 L
Weight
880 G
985 G
Fill Weight
620 G
700 G
Internal Chest Circumference
155 CM
162 CM
Internal Hip Circumference
135 CM
142 CM
Internal Foot Circumference
94 CM
100 CM
CONSTRUCTION AND MATERIALS
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.
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.
Ultralight 7D fabrics for minimal weight and packed size
RDS 850+ Loft Premium Goose ULTRA-DRY Down™ for maximum insulation value
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
Shell: 100% Nylon, Lining: 100% Nylon, Primary Filling Material: GOOSE DOWN (Min. 90% Down), Stuffsack: 100% Nylon excluding Trims