Helium UL Bivy

When weight and pack size matter more than anything else, the Helium UL Bivy is our pick for solo thru-hikers, alpine climbers, and bikepackers who need real weather protection without the bulk. Pertex Shield Diamond Fuse fabric keeps out rain and wind while breathing well enough to cut down on condensation. A zippered mesh panel and clamshell opening round it out for bug-free nights and easy in-and-out.

• Pertex Shield Diamond Fuse fabric delivers waterproof, windproof protection with strong abrasion resistance — built for rough conditions and tight rocky bivouacs
• Fully taped seams seal out moisture during heavy overnight rain so you stay dry without relying on a separate rain fly
• Breathable material layout reduces condensation buildup inside — a real issue in Southern humidity and shoulder-season temperature swings
• Packs down smaller than a water bottle in one size that fits any pack — the go-to emergency or ultralight primary shelter for fast-and-light missions
• Zippered mesh panel lets you sleep with ventilation and a view while keeping insects out — clamshell opening makes getting in and positioning your pad straightforward