Outdoor Research Alpine AscentShell Bivy Size:O/S but maximum opportunity for adventure

but maximum opportunity for adventure

R-Value (ASTM F3340-18):   8

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

Weight [g/m]: 51

Outdoor Research Alpine AscentShell Bivy Size:O/S but maximum opportunity for adventure"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