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This 3-season sleeping bag features Sierra Designs water-resistant DriDown&#8482. It resists water and dries fast for backpacking in chilly, wet weather.

  • Features

    • Regular down takes on water and is very difficult to dry; DriDown proprietary process treats each individual duck down plume with a hydrophobic finish
    • With the duck down now resistant to water, the insulation maintains its loft and stays dry 7 times longer than untreated down
    • It also performs better in high humidity than regular down and, in case it accidentally gets wet, it will dry out faster, too
    • Lightweight yet durable 30-denier micro-ripstop polyester shell and comfortable, moisture-wicking polyester lining warm up fast
    • Baffle construction keeps down from migrating, eliminating cold spots
    • Full-length 2-way, double sliding zipper allows easy venting; locking slider is backed by wide, antisnag binding tape
    • Snag-free zipper tracks prevent the dreaded stuck zipper by creating a barrier between the lining and the zipper track
    • Fully insulated draft tube backing the zipper keeps body heat in and cold air out
    • Ergonomic, nonrestrictive hood cradles your head in warmth; hood features differentiated drawcords that make fit adjustments easy, even in the dark
    • Roomy, ergonomically shaped footbox enhances comfort and warmth of feet
    • Sierra Designs Zissou 23°F comes with stuff sack and storage bag
    • European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags

    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 Sierra Designs Men's Sleeping Bags
  • Technical Specs

    Best Use

    Backpacking

    Tested Lower Limit

    23 degrees (F) - EN

    Tested Comfort

    34 degrees (F) - EN

    Temperature Rating (F)

    23 degrees (F)

    Temperature Rating (C)

    -5 degrees (C)

    Shell

    Ripstop polyester

    Zipper Location

    Left

    Insulation Type

    Down

    Water-Resistant Down

    Yes

    Fill

    700-fill duck down

    Lining

    Polyester

    Sleeping Bag Shape

    Mummy

    Stuff Sack Size

    7 x 16 inches

    Stuff Sack Volume

    10 liters

    Gender

    Unisex

  • Reviews
    39 reviews with an average rating of 3.7 out of 5 stars

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