Outdoor Research Helium Bivy (PFAS-Free) - Ultralight Waterproof Bivy Shelter (Pertex® Diamond Fuse)

Ultralight Shelter for Fast & Light Missions

The Outdoor Research Helium Bivy (PFAS-Free) is an award-winning ultralight bivy designed for adventurers who prioritise speed, minimal weight, and dependable weather protection.

Updated with Pertex® Shield Diamond Fuse technology, it delivers improved durability while remaining exceptionally lightweight-now 14% lighter than the previous generation. Fully seam-taped and waterproof, it offers reliable protection in exposed conditions without the bulk of a traditional tent.

The clamshell opening makes entry and exit quick and easy, while the streamlined, tapered shape reduces weight and pack size-ideal for thru-hikers, climbers, and fastpackers. A high-volume toe box improves comfort, and the integrated pole system adds structure while keeping things minimal.

PFAS-free construction (Cenote version) ensures a more environmentally conscious design without compromising performance.

Why You'll Love It

• Ultralight & Packable - Designed for fast, minimalist travel
• Waterproof Protection - Fully seam-taped Pertex® Shield fabric
• Durable Upgrade - Diamond Fuse technology improves longevity
• Quick Setup - Simple, efficient bivy design
• Eco-Conscious - PFAS-free construction

Key Features

• Clamshell opening with internal fasteners
• Single-pole system for structure
• No-see-um mesh for ventilation
• High-volume toe end for improved comfort
• Reflective details for visibility
• Compact packed size
• Compatible with tapered sleeping pads

Specifications

• Weight (with pole): 484g
• Weight (without pole): 432g
• Length: 208 cm
• Width (head): 66 cm
• Width (foot): 48 cm
• Packed Size: 31 × 9 cm

Materials

• Pertex® Shield Diamond Fuse 2.5L, 30D ripstop nylon
• 40D nylon TPU-laminated floor
• Polyester no-see-um mesh
• PFAS-free construction

Best For

• Fastpacking
• Alpine missions
• Bikepacking
• Thru-hiking
• Minimalist camping