Marmot NanoWave 45 Sleeping Bag - Men's

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When space and weight are at a premium on biking trips, kayaking adventures and backpacking treks, the Marmot NanoWave 45 sleeping bag easily stuffs into a pannier, stern compartment or pack.

  • Features

    • Lightweight mummy design, blanket construction and synthetic Spirafil high-loft insulation trap warmth even when wet, keeping you cozy down to temperatures around 45°F
    • Full-length YKK® zipper with 2-way sliders wraps around the footbox for easy ventilation; snagless draft tube helps prevent air from sneaking in and fabric from catching
    • "Feely" drawcords let you make adjustments in the dark


    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 Marmot Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    49 degrees (F) - EN

    Tested Comfort

    56 degrees (F) - EN

    Temperature Rating (F)

    49 degrees (F)

    Temperature Rating (C)

    9 degrees (C)



    Zipper Location


    Insulation Type






    Sleeping Bag Shape


    Stuff Sack Size


    Stuff Sack Volume




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