Montbell Seamless Alpine Burrow Bag #2 Long - Sunflower SIZE:One Size As with all Patagonia products

As with all Patagonia products

40-denier nylon taffeta fabric encases EXCELOFT synthetic filling

but the R1 Crew is a lightweight

Mesh lined

Montbell Seamless Alpine Burrow Bag #2 Long - Sunflower SIZE:One Size As with all Patagonia productsThe Seamless Alpine Burrow Bag is made using Montbell's proprietary synthetic insulation, Exceloft. Exceloft offers advantages in wet or humid conditions that could potentially compromise a down sleeping bag. EXCELOFT is perfectly paired with our seamless construction, which reduces sewing holes where warm air can escape and create a more airtight sleeping bag. As a result, this simpler method of construction allows Exceloft to loft to its fullest