Outdoor Research Alpine AscentShell Bivy Size:O/S Weight [g/m]: 51

Weight [g/m]: 51

R-Value (ASTM F3340-18):   8

and PackTowl®inside the 1

steady water pressure

PU port window cold-crack tested to -60°F/-51°C

Outdoor Research Alpine AscentShell Bivy Size:O/S Weight [g/m]: 51"Less is more" doesn't always ring true, but the Alpine AscentShell Bivy packs as much as possible into a small alpine shelter. On our lightest ascents into the wilderness, this bivy offers serious protection in all four seasons. Outdoor Research's Helium AscentShell membrane keeps us secure in unruly weather, and it boasts breathability that ensures our outdoor comfort during the hotter months as well. Details: Four season bivy for alpinism and solo