SeasonFour 10°F - 18°F

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The SeasonFour is a winter oriented hooded, but still zipper-less top entry Sastrugi based bag

Wide open hood to facilitate entry, with 5" draft collar controlled by an internal and external draw cord

2.75" loft for the 18°F, 3.25" loft for the 10°F

Roomy or mummy, selectable in menu. 

The roomy cut maintains shoulder width to hip level, giving more space to move than found in an average sleeping bag. This may be appreciated in a zipperless design, but leaves air space to warm up

Some folks might prefer the rapidly tapering mummy cut for a more efficient shape

18°F size 74" - 59" - 40" in 10d fabrics and no overfill: 20.3 oz down with a 29.0 oz total weight

10°F size 74" - 59" - 40" in 10d fabrics and no overfill: 26.5 oz down with a 35.5 oz total weight

 Top entry, zipper-less bag built to last

10°F Season Four on the left; 15°F on the right. Both built with the Roomy Shape pattern