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The Mountain Hardwear Lamina 20 Sleeping Bag uses welded seam construction that doesn't pinch the insulation, maximizing loft, durability and warmth for backpacking in freezing weather.

  • Features

    • With a European Norm (EN) lower-limit rating of 20°F, the Lamina 20 Sleeping Bag is ideal for 3-season backpacking when temperatures drop well below freezing
    • Lightweight synthetic insulation has excellent loft retention, and is durable, soft and compressible
    • Welding stabilizes the fill without sewing through the bag, eliminating moisture penetration points and maximizing loft
    • Insulation is laid in a wave shape, enhancing loft and increasing thermal efficiency; offset welds increase stability and loft
    • Slightly wide cut gives you extra room to move inside the bag; comfort mummy cut efficiently maximizes warmth without constriction
    • Tough, 40-denier micro ripstop nylon shell provides durabilty; 40-denier polyester taffeta lining breathes for comfort and feels great against skin
    • Insulated draft tube extends to bottom of bag to eliminate cold spots
    • Face gasket and ergonomic draft collar seal out cold air
    • Full-length, 2-way zipper with locking slider is backed by wide, antisnag binding tape
    • Comfort footbox is shaped to allow feet to rest naturally; shape preserves loft and allows insulation to drape close to feet for warmth
    • Mountain Hardwear Lamina 20 Sleeping Bag comes with a stuff sack and a storage bag
    • Note: European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags


    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 Mountain Hardwear Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    20 degrees (F) - EN

    Tested Comfort

    29 degrees (F) - EN

    Temperature Rating (F)

    20 degrees (F)

    Temperature Rating (C)

    -7 degrees (C)


    Ripstop nylon

    Insulation Type



    Thermal Q



    Sleeping Bag Shape


    Stuff Sack Size

    7 x 15.5 inches

    Stuff Sack Volume

    10.5 liters



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