NEMO Kayu 15 Sleeping Bag - Men's

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With packable 800-fill-power down and aggressive, thermally efficient patterning, the men's NEMO Kayu 15 mummy sleeping bag is an excellent choice for fast-and-light adventures.

  • Features

    • Each curve is tailored for efficiency and comfort—the contoured hood, shaped footbox and body-mapped tapered core are designed for ideal fit with no wasted space
    • 800-fill-power down is hydrophobic, PFC-free and Responsible Down Standard (RDS) certified for traceability and humane treatment throughout the supply chain
    • Down insulation is treated with Nikwax™ for water-resistant warmth at your campsite
    • Shell and lining have been treated with a durable water repellent (DWR) to help resist moisture
    • Thermo Gills™ provide customizable temperature regulation without letting cold drafts in
    • Waterproof and breathable footbox and hood protect you from head to toe against tent wall condensation
    • A fabric set of 20-denier nylon ripstop and 30-denier nylon taffeta is soft and plush for a comfortable sleep experience
    • Aggressive patterning is designed for optimal thermal efficiency and packability
    • Full-length YKK zipper with snagless baffle construction and draft tube seals warm air in
    • Pairs with the women's Aya sleeping bag (sold separately)


    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 NEMO Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    16 degrees (F) - EN

    Tested Comfort

    28 degrees (F) - EN

    Temperature Rating (F)

    15 degrees (F)

    Temperature Rating (C)

    -9 degrees (C)


    20-denier ripstop nylon

    Zipper Location


    Insulation Type


    Water-Resistant Down



    PFC-free down


    30-denier nylon taffeta

    Sleeping Bag Shape


    Stuff Sack Volume

    6 liters



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