Sea to Summit Amplitude Down 25F Sleeping Bag

$379.00 to $399.00
Color:Blue
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$399.00
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Returning to the same campsite each night? You'll have a cozy bed to look forward to with the Sea to Summit Amplitude Down 25F sleeping bag. It's spacious, cozy and offers versatile ventilation.

  • Features

    • Each side of the Amplitude has a full-length side zipper; a third zipper can be found in the foot box, allowing the top section to be removed and used as a comforter
    • Shaped hood and zipper draft tubes keep cold out and warmth in
    • 750-fill-power duck down provides cozy warmth
    • Vertical baffles over the chest prevent down shifting as you roll over in your sleep
    • Includes lightweight Ultra-Sil™ compression bag for easy storage and transport
    • Form a snug sleeping bag for 2 by zipping to another Amplitude or Explore, Ascent™, Trek™, Traverse™, Altitude™, Journey™ or Venture™ sleeping bag (not included)

    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

    Camping

    Tested Lower Limit

    25 degrees (F) - EN

    Tested Comfort

    37 degrees (F) - EN

    Temperature Rating (F)

    25 degrees (F)

    Temperature Rating (C)

    -4 degrees (C)

    Weight

    Regular: 2 lbs. 7 oz.

    Long: 2 lbs. 11 oz.

    Shell

    Nylon

    Zipper Location

    Left/Right

    Insulation Type

    Down

    Water-Resistant Down

    Yes

    Fill

    750-fill-power duck down

    Fill Weight

    Regular: 1 lb.

    Long: 1 lb. 1.6 oz.

    Lining

    20-denier nylon

    Sleeping Bag Shape

    Rectangular

    Fits Up To (in.)

    Regular: 72 inches

    Long: 78 inches

    Shoulder Girth (in.)

    Regular: 76 inches

    Long: 82 inches

    Hip Girth (in.)

    Regular: 75 inches

    Long: 80 inches

    Stuff Sack Size

    7 x 16 inches

    Stuff Sack Volume

    10 liters

    Compressed Volume

    Regular: 6.3 liters

    Long: 8 liters

    Gender

    Unisex

  • Reviews
    8 reviews with an average rating of 4.9 out of 5 stars

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