Uploaded March 2026 | Updated September 2026, 2 days ago

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Looking for the best ultralight rain jacket for hiking? Outdoor Research built the Helium UL for fast miles and unpredictable mountain weather.

Outdoor Research was born in the elements and built on the trail. For over four decades we’ve designed gear for hikers who keep moving when the weather turns.

From alpine ridgelines to long-distance trails, this system is built for real hiking conditions — featuring the Helium UL Jacket, Ferrosi pants, technical headwear, and sun protection designed for long days outside.

The Helium UL Jacket is our lightest waterproof hiking shell yet. Built with Toray Dermizax™ 3D 2.75-layer waterproof protection, it delivers improved breathability, durability, and comfort while packing down small enough to disappear into your pack.

Features include:

• Toray Dermizax™ 3D 2.75L waterproof protection
• Fully seam-taped construction
• Wire-brim hood for visibility in rain
• YKK® Aquaguard® zippers
• Clean bonded edges for durability
• Ultralight packable design

Whether you're thru-hiking, peak bagging, trail running, or traveling light, the Helium UL is built for hikers who move fast and stay out longer.

Shop the Men's Helium UL Jacket → outdoorresearch.com/products/mens-helium-ul-jacket-322681
Shop the Women's Helium UL Jacket → outdoorresearch.com/products/womens-helium-ul-jacket-322837

Featured Hiking System:

Helium UL Jacket – Ultralight waterproof protection
Ferrosi Pants – Breathable durability for long days on trail
Outdoor Research Headwear – Lightweight protection for changing weather
Sun Collection – Technical sun protection for exposed terrain