Arc'teryx Zeta SL Review

Overview

The Zeta SL is Arc’teryx’s emergency rain shell for hikers: a 2-layer Gore-Tex Paclite Plus jacket that weighs 310 g (10.9 oz) and is built to be carried every day and used only when the sky turns. It trades the thin, fragile fabrics common in this weight class for a sturdier 40D face and a full set of adjustments. The cost is a $299 price tag and a stripped-down feature list, with no pit zips and no helmet-compatible hood.

Key Specs

Spec	Detail
Weight	310 g (10.9 oz), men’s medium
Construction	2L N40r GORE-TEX with PACLITE Plus
Face fabric	40D ripstop nylon
Lining	Nylon
Seams	Fully taped
Hood	StormHood with halo adjuster, laminated brim, not helmet compatible
Front zip	WaterTight, full length
Pockets	Two hand pockets, WaterTight zippers with RS sliders
Adjustments	Hem drawcord, die-cut Velcro cuff tabs
Fit	Trim, hip length; 77.8 cm (30.6 in) center back length
Other	Gusseted underarms, laminated hanger loop, brushed microsuede chin guard
MSRP	$299

Performance

Weather protection. Testers consistently rate the Zeta SL as a serious storm jacket for something this light. Outdoor Gear Lab named the women’s version its top pick for a torrential downpour and called its water resistance exceptional. The Big Outside’s reviewer reported staying dry through hours of hiking in wind-driven rain. Fully taped seams, a WaterTight front zip and waterproof pocket zippers mean there are few places for water to find a way in. The DWR finish also lasts. Switchback Travel’s tester went six months of heavy use without needing to retreat it.

Durability. This is where the jacket separates itself from the ultralight pack. The 40D ripstop face is heavier than the fabrics on most shells of similar weight. Switchback Travel’s reviewer downclimbed abrasive slot canyons in it without worrying and saw no wear afterward. A Coffee or Die reviewer carried a heavy pack with a hip belt in it, and the jacket still looked new. The high hand pockets sit above a pack hip belt or climbing harness, so the zippers stay reachable under load.

Breathability. The Paclite Plus membrane gets decent but unspectacular marks. The Big Outside described it as good if not exceptional, enough to avoid overheating at moderate temperatures. Paclite Plus is also softer against bare skin than earlier Paclite, which matters on a warm, humid day when the jacket is the only thing between you and the rain. The jacket has no pit zips, and Outdoor Gear Lab docked it for that. In hard, sweaty climbs, the only venting option is the front zip.

Fit and mobility. Arc’teryx cuts the Zeta SL trim but not tight. The Big Outside’s reviewer fit two base layers and an insulated vest underneath. Outdoor Gear Lab noted the fit is more forgiving than that of its predecessor, the Beta SL, which was slimmer and required sizing up to layer. Gusseted underarms and articulated patterning keep the jacket from riding up when arms go overhead. The hem has a slight drop in the back.

Hood and packability. The StormHood tightens with a halo adjuster and has a laminated brim that keeps rain off the face, but it does not fit over a climbing helmet. For hikers, this rarely matters. Packability is good, though not a pocket-stuffer. Outdoor Gear Lab pointed out that the jacket does not pack into its own pocket. It compresses small enough for a pack’s lid or side pocket, but it takes up more room than the thinner, lighter Zeta FL.

Pros & Cons

Pros

• 310 g for a jacket with a 40D face fabric, a sealed front zip and fully taped seams
• Strong wet-weather performance in wind-driven rain
• Durability well above that of other shells at this weight
• Soft next-to-skin feel; DWR holds up over months of use
• Hip-belt-friendly pockets with waterproof zippers
• Adjustable hood, cuffs and hem

Cons

• $299 MSRP is steep for a jacket meant for emergencies
• No pit zips; breathability is merely good
• No pocket to stuff it into
• Hood does not fit over a helmet
• Trim cut, so sizing up may be needed for bulky midlayers

Who Should Buy This

The Zeta SL suits three-season backpackers and thru-hikers who want one shell that can handle days of rain without getting shredded by brush, pack straps or rock. It also suits hikers who would rather carry a 40D jacket than baby a lighter one. Weight-obsessed hikers who rarely see sustained rain, or who mostly want a shell for a few downpours, should consider the lighter Zeta FL or a cheaper, thinner jacket. Climbers who need a helmet-compatible hood, and hikers who run hot and want pit zips for steep climbs, should look at Arc’teryx’s Beta line or other shells with more venting.

Verdict

The Zeta SL is a tough, reliable, light shell that stays dry in real storms and holds up under pack straps and rock. It costs a lot and lacks venting, but for hikers who want a durable shell at this weight, few jackets do more with 310 g. Buy it if durability matters more than saving the last 100 g or the last $100.