Award-winning for its ultralight prowess, updated with our most durable lightweight Helium fabric with Diamond Fuse technology. This clamshell opening bivy is ideal for fast and light missions.
The tapered shape of the Helium Bivy works best with tapered shape sleeping pads with narrower dimensions at the foot, ideally 19” or narrower.
Ultralight comfort & quick to set up and break down.
The Helium Bivy is our lightest, best-selling, and most awarded bivy sack of all time. Incredibly quick to set up and breakdown, the ultralight Helium Bivy is 14% lighter than its last generation, and has everything the outdoor minimalist needs to be comfortable. Thru-hikers and bikepackers love the Helium for its refined footprint and reduced weight, and trust it for its durable, lightweight, waterproof Pertex® Diamond Fuse technology. A clamshell opening makes it easy to get in, get out, and resists wear and tear for future seasons of adventuring to come. This is the ideal shelter for minimalists who are looking to trade weight for speed, agility, and performance.
Pertex developed Diamond Fuse technology as a unique way of improving the durability and abrasion resistance of fabrics without adding any unnecessary weight. Diamond Fuse fabrics use yarns with unique diamond shaped filaments that lock together to create a durable and highly abrasion resistant fabric. This engineered structure allows Diamond Fuse fabrics to remain very stable over extended wear and washing.
bluesign® Approved Materials
Bluesign® is a system that provides safer and more sustainable environments for people to work in and everyone to live in. Simply put, bluesign changes the environmental impact of textiles for good. Outdoor Research products made with bluesign-approved materials have gone the extra step to provide the greatest safety, quality, and integrity of responsible chemicals management. Choose bluesign when you want to make an impact by reducing your impact on the planet.
The Infinite Guarantee®
Outdoor Research® gear is guaranteed to perform throughout the lifetime of the product. Get your gear back on track by filing a claim on our Warranty Page
Have a question? Problem? Other request? We’re here to help you find a solution.
Our customer service is waiting for your call at 855-967-8197, on weekdays Monday-Friday between 8am-5pm PST. If you prefer email, you can send your query to email@example.com
Thanks for getting in touch. We can’t wait to get you back outside with your gear.
Machine wash cold separately, rinse thoroughly. Do not bleach. Do not use fabric softener. Tumble dry low or line dry in shade. Do not iron. Do not dry clean.