Outdoor Research Helium UL Pant vs Arc'teryx Beta Pant

Waterproofing is the non-negotiable core of any hiking rain pant — nothing undermines a trip faster than wet legs. A truly reliable system keeps you dry through sustained downpours, puddles, and brushy terrain without leaks or seepage. The Outdoor Research Helium UL Pant earns top marks for its fully taped seams and consistent performance, with buyers repeatedly noting it keeps them completely dry even in heavy rain, with no issues from zippers or seams. The Arc'teryx Beta Pant, built with Gore-Tex, also delivers strong waterproofing, but a few users report minor leakage in extreme conditions, suggesting its protection, while excellent, isn’t quite as universally flawless. For buyers who prioritize absolute, no-compromise dryness, the Helium UL has the edge.

Breathability determines whether you stay dry from sweat as well as rain — critical on steep climbs or warm conditions. The Helium UL Pant’s Pertex fabric is praised for its exceptional breathability, with users noting they can wear it in warm weather without overheating, and that it outperforms less expensive options significantly. The Beta Pant offers decent venting through its top zippers, but feedback is more limited and focused on manual adjustments rather than inherent fabric performance. Buyers of the Helium UL consistently report better overall moisture management during active use, making it the better choice for high-output hikes where internal sweat buildup is a concern.

Durability matters when you’re scrambling over rocks, brushing through brush, or wearing crampons — you need pants that won’t tear or degrade after a few outings. The Arc'teryx Beta Pant stands out with reinforced insteps, crampon patches, and a 80D GORE-TEX shell that users describe as hard-wearing and long-lasting, even after heavy use in Patagonia. While the Helium UL’s 15D nylon is strong for its weight and resists rips well, it’s inherently more delicate and less suited to abrasive terrain. For hikers tackling rough, technical trails or expecting long-term use, the Beta Pant’s rugged construction is a clear advantage.

Comfort on the trail isn’t just about soft fabric — it’s about freedom of movement, fit, and how the pants feel next to your skin over hours of hiking. The Arc'teryx Beta Pant excels here with a generous leg cut, articulated knees, and a snug yet non-restrictive fit that allows full range of motion without pinching. Buyers describe it as a 'perfect all-around pant' that feels comfortable even when worn directly against the skin. The Helium UL, while lightweight, has a slim fit that many find restrictive, with several users recommending sizing up to avoid tightness. If you value unrestricted mobility and all-day comfort, the Beta Pant is the clear winner.

Packability determines whether you’ll actually carry the pants when not in use — and the Helium UL Pant is a standout here. Its self-stowing pocket turns the entire pant into a compact 5x5 inch bundle that disappears into a pack, a feature repeatedly praised by ultralight hikers and bikepackers. The Beta Pant is lightweight and packs down small, but lacks a dedicated stuff sack and doesn’t compress nearly as efficiently. For those who prioritize minimizing pack volume and weight, the Helium UL’s ability to vanish into a pocket is unmatched and makes it far more likely to be carried on every hike.

Ease of use affects how quickly and easily you can get your rain pants on and off — especially in sudden rain or when using the restroom. The Arc'teryx Beta Pant shines with full-length side zippers, an elastic waist with a welded drawcord, and internal gaiters that let you slip them on over boots without removing your shoes. Buyers consistently call them easy to pull on in a rush. The Helium UL, by contrast, has no side zippers, making it difficult to get on over boots, and lacks pockets, forcing you to remove them entirely to access gear. For anyone who values convenience and speed, the Beta Pant’s thoughtful design makes a huge practical difference.