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.

Features:

– 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
– Vertical box baffles in the torso area accommodates extra down and boosts warmth around the core, vertical baffles on chest optimises positions of down to prevent it moving during use
– Lower part of the bag uses a sewn through horizontal baffle construction to minimise weight
– ½ zip with two sliders aids access and allows ventilation from mid-section of bag
– Draft tube prevents heat loss through the zipper
– Includes hood draft collar
– Includes lightweight Ultra-Sil™ Nano compression bag for compact storage

Specifications:

EN13537 TEMP RATING COMFORT: 4°C | 38°F
EN13537 TEMP RATING LOWER LIMIT: -2°C | 28°F
EN13537 TEMP RATING EXTREME: -18°C | 0°F
COMPRESSION SACK SIZE: 2 EXTRASMALL (3.3L TO 1.3L)

DIMENSIONS
LONG 227 X 89cm
REGULAR 212 X 83cm

FILL WEIGHT
LONG 345g
REGULAR 300g

INTERNAL CHEST CIRCUMFERENCE
LONG 158cm
REGULAR 150cm

INTERNAL HIP CIRCUMFERENCE
LONG 138cm
REGULAR 130cm

RECOMMENDED USER HEIGHT
LONG: UP TO 198cm
REGULAR: UP TO 183cm

WEIGHT
LONG 560g
REGULAR 490g