Sea to Summit Spark Ultralight 40F Sleeping Bag

$339.00 to $359.00
Color:Light Grey/yellow
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Lightweight and technical, the Sea to Summit Spark Ultralight 40F sleeping bag is designed to keep you as warm as possible while minimizing packed weight and size.

  • Features

    • Superlight 7-denier and 10-denier fabrics offer minimal weight and packed size
    • 850+ fill-power Premium Goose UltraDry Down™ certified to the Responsible Down Standard (RDS) and provides maximum insulation value
    • Contoured mummy shape provides comfort and efficient insulation
    • Vertical chest baffles prevent down migration
    • Note: This bag is not designed to zip with another

    Imported.

    Many sleeping bags are rated for temperature by an independent testing protocol. REI and the broader industry now use the International Organization for Standardization (ISO) 23537 protocol, which improves on the older European Norm (EN) 13537 standard; you may still see older items in our assortment that were only EN tested. With either protocol, each bag gets a Comfort (or T-Comfort) rating and Lower Limit (or T-Limit) rating. 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. Ratings are based on a person wearing one long underwear layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38. Many brands use the Comfort rating for women's bags and the Lower Limit rating for men's and unisex bags. Everyone's body and sleep comfort differ, and conditions of use (posture, clothing, sleeping pad R-value, wind, humidity, etc.) affect total insulation, so EN and ISO ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth.
    View all Sea to Summit Men's Sleeping Bags
  • Technical Specs

    Best Use

    Backpacking

    Tested Lower Limit

    40 degrees (F) - EN

    Tested Comfort

    48 degrees (F) - EN

    Temperature Rating (F)

    40 degrees (F)

    Temperature Rating (C)

    5 degrees (C)

    Weight

    Regular: 12 ounces

    Long: 13.6 ounces

    Ultralight

    Yes

    Shell

    10-denier nylon

    Zipper Location

    Left

    Insulation Type

    Down

    Water-Resistant Down

    Yes

    Fill

    850+ UltraDry Down

    Fill Weight

    Regular: 6 ounces

    Long: 7 ounces

    Lining

    7-denier nylon

    Sleeping Bag Shape

    Mummy

    Fits Up To (in.)

    Regular: 72 inches

    Long: 76 inches

    Shoulder Girth (in.)

    Regular: 59 inches

    Long: 62 inches

    Hip Girth (in.)

    Regular: 51 inches

    Long: 54 inches

    Stuff Sack Size

    Unavailable

    Stuff Sack Volume

    Unavailable

    Compressed Volume

    Unavailable

    Gender

    Unisex

    Sustainability

    Down certified to the Responsible Down Standard (RDS)

  • Reviews
    100 reviews with an average rating of 4.6 out of 5 stars

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