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Alpine Burrow bag Thermal Sheet

Style #2321186

  • 50℉

Price: $109.00

Member Points: 1,090

Our lightest synthetic offering, this “climber’s bag” is a smart piece to have cached in your pack in the event of challenging variable weather conditions and an unplanned bivouac. During summer months, creative backcountry enthusiasts integrate their favorite ultralight garments for use in a sleep system. This product is also ideal for those staying in hostels while tramping around Europe.


GM (Gunmetal)



Updated 03/22/18 16:15 (EST)


  • Spiral Stretch System (US. Patent NO. 7,900,301)
  • Drawstring neck adjustment to hold in body heat
  • 1/2 length zipper to save weight
  • Auto lock zipper
  • Insulated using Zig-Zag Construction
  • Tapered stuff sack


Weight1lb. 6 oz. (622 g)
InsulationExceloft® synthetic insulation
Fabric40-denier multi-filament nylon
DWRStandard DWR treatment
Compressed sizeφ5.5 x 10.9 in. (φ14 x 28 cm), 3.4 L
Country of originCHINA
Other[Thermal Guideline] 50℉/10℃

[Max User Height] 6' / 183cm

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Actual color may vary.


Montbell has adapted a classic tailor’s trick by integrating a woven fabric “cut on the bias”. By orienting the fabric’s warp and weft threads at 45 degrees to most major seam lines the sleeping bag becomes more fluid or elastic in nature. Additionally, to create an even more comfortable system we utilize an elastic stitch technique to create small “gathers” in the quilting. By combining the strategic seam orientation and the elasticized gathers we offer unrivaled fit and comfort. These innovations allow the sleeping bag to stretch with you as you change positions throughout the night, drawing the insulation closer to your body and eliminating drafty dead spaces. By using a sleeping bag with Super Spiral technology you keep body heat inside your sleeping bag, where it belongs.

The history and evolution of montbell sleeping bags

The Super Spiral Stretch Series