Sea to Summit Spark Ultralight Sleeping Bag Liner

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Built for fast-and-light adventures, this Sea to Summit Spark Ultralight sleeping bag liner is a great pick for summer overnights or boosting your sleeping bag's warmth on chillier trips.

Features

  • 7-denier shell and 7-denier liner materials help to achieve an impressively light weight and compact packed size
  • 850-fill-power down provides cozy warmth
  • Sewn-through quilted construction makes this an incredibly light and compact bag
  • 1/3-length zipper
  • Includes lightweight Ultra-Sil™ compression bag and storage cell

Imported.

Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Sea to Summit Backpacking Sleeping Bags

Technical Specs

Best Use

Backpacking

Tested Comfort

50 degrees (F) - ISO

Temperature Rating (F)

50 degrees (F)

Temperature Rating (C)

10 degrees (C)

Ultralight

Yes

Shell

7-denier nylon

Zipper Location

Left

Insulation Type

Down

Water-Resistant Down

Yes

Fill

Ultra-dry down

Lining

7-denier nylon

Sleeping Bag Shape

Mummy

Gender

Unisex

Reviews
148 reviews with an average rating of 4.6 out of 5 stars

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