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Highlights
SECOND SUMMIT: Let's give gear a second chance. Shop our expertly inspected, pre-owned gear delivered to you in like new condition and protected by the Sea to Summit Guarantee.
BEST USE: Ultralight Backpacking
PERFORMANCE: Warm Weather
WEIGHT: 12oz | 340g
COMPRESSED VOLUME: 1.5 liters
LOWER TEMP RATING: 40ºF | 5ºC
Description
The Spark Ultralight Mummy Sleeping Bag Series spans everything from an ultralight down-filled liner, to a mid-winter fast-and-light sleeping bag. Each model uses premium materials and no-frills design to provide ...
Product Details
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The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. The test produces a Lower rating (for male sleepers) and a Comfort rating (for female sleepers). Both are listed in the features table on the product page.
A unisex sleeping bag with a Lower limit of 14ºF means a man should be comfortable down to air temperatures of 14ºF. The same bag will also have a Comfort limit, in the realm of 27°F, so a woman would be comfortable down to an air temperature of 27ºF. These ratings require a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.
A variety of factors impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner.
![40 || Spark Ultralight Sleeping Bag Regular](http://seatosummit.com/cdn/shop/files/Spark-down-sleeping-bag-Regular-SP1.jpg?crop=center&height=120&v=1714512386&width=120)
![Description || Spark Ultralight Sleeping Bag](http://seatosummit.com/cdn/shop/files/STS-Description-image-Spark.jpg?v=1714512389&width=1500)
Description
The Spark Ultralight Mummy Sleeping Bag Series spans everything from an ultralight down-filled liner, to a mid-winter fast-and-light sleeping bag. Each model uses premium materials and no-frills design to provide cutting-edge performance.
Ultralight does not mean ultra-tight: The Spark mummy sleeping bags are snug but still have adequate wiggle room for the performance-oriented, backcountry user.
Tech specs
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Best UseUltralight Backpacking
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Comes WithUltra-Sil™ compression bag and storage cell
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InsulationUltra-Dry Down 850+ Loft
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ShapeMummy
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Shell FabricUltralight 10D Nylon Shell
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Zip OptionsSpark 0-II: Left-side #3 YKK zipper; Spark III-IV: #5 YKK
40°F Regular | 40°F Long | 28°F Regular | 28°F Long | 18°F Regular | 5°F Long | 5°F Regular | Liner Long | Liner Regular |
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