Ultralight
The Best Ultralight Rain Jackets (2027)
The best ultralight rain jackets for 2027: the lightest shells that still tape their seams, plus honest notes on warmth and when an insulated rain jacket is the right different answer.
The short answer
The Outdoor Research Helium is the best ultralight rain jacket for 2027. Hikers who need venting more than minimum weight should step up to the Marmot PreCip Eco.
Our top picks at a glance
- Outdoor Research Helium Rain JacketA 6.2 oz Pertex Shield shell that disappears into any pack.Best ultralight rain jacket
- Frogg Toggs Ultra-Lite2 Rain SuitA full rain suit for the price of lunch; the emergency-shell legend.Cheapest ultralight insurance
- Marmot PreCip EcoThe classic value shell, updated with PFC-free NanoPro Eco coating.Step-up ultralight with venting
- Rab Downpour Plus 2.0A fully featured Pertex Shield 2.5-layer shell for hiking and climbing.Best Pertex all-rounder
What owners report
Synthesized from recurring themes in long-term owner feedback.
Most praised
- These are the jackets gram counters actually keep in the pack on blue-sky starts, which is the whole point
- Quick-drying thin fabrics suit fast-moving hikers who cycle the shell on and off through passing showers
Common complaints
- Owners going this light give up storm hoods and pocket counts that midweight hiking shells include
- A shell carried for emergencies still needs its water repellent finish refreshed or it feels clammy when finally worn
The picks, ranked
Every product in this lineup was picked for this use case, ranked with our strongest choices first. If a product from the wider category does not genuinely fit this scenario, it is not listed here.
| # | Product | Award | Weight (men's M) | Construction | Waterproof rating | Venting | Features |
|---|---|---|---|---|---|---|---|
| 1 | Outdoor Research Helium Rain Jacket | Best ultralight rain jacket | 6.2 oz (176 g) | 2.5-layer Pertex Shield Diamond Fuse | 30,000 mm (Pertex Shield) | None (no pit zips) | Chest pocket stuff sack, carabiner loop |
| 2 | Frogg Toggs Ultra-Lite2 Rain Suit | Cheapest ultralight insurance | - | Nonwoven polypropylene with micro-porous film | - | None | Storm flap, adjustable hood, stuff sack |
| 3 | Marmot PreCip Eco | Step-up ultralight with venting | 10.1 oz (286 g) | 2.5-layer NanoPro Eco PU coating | - | Pit zips | Roll-up hood, DriClime chin guard |
| 4 | Rab Downpour Plus 2.0 | Best Pertex all-rounder | - | Pertex Shield 2.5-layer | - | - | Adjustable hood, stuffs into pocket |
Best ultralight rain jacket
Outdoor Research Helium Rain Jacket
A 6.2 oz Pertex Shield shell that disappears into any pack.
6.2 oz of Pertex Shield Diamond Fuse with fully taped seams. The Helium remains the ultralight rain jacket to beat for hikers who carry rain gear daily and use it in bursts.
Strengths
- 6.2 oz is among the lightest fully featured shells
- Pertex Shield Diamond Fuse fabric is tougher than its weight suggests
- Packs into its own chest pocket with a clip loop
- Adjustable hood and elastic cuffs keep the design trail-serious
Limitations
- No pit zips; breathability is membrane-only
- Minimalist fit limits thick layering
- Light fabric demands care around straps and rock
| Weight (men's M) | 6.2 oz (176 g) |
|---|---|
| Construction | 2.5-layer Pertex Shield Diamond Fuse |
| Waterproof rating | 30,000 mm (Pertex Shield) |
| Venting | None (no pit zips) |
| Features | Chest pocket stuff sack, carabiner loop |
Best for: Thru-hikers and climbers who carry rain gear daily but use it rarely.
Skip if: You live in genuinely wet climates; all-day deluges deserve a burlier shell.
Cheapest ultralight insurance
Frogg Toggs Ultra-Lite2 Rain Suit
A full rain suit for the price of lunch; the emergency-shell legend.
A jacket and pants at about 10.6 oz total for pocket money. Fragile, yes, and still the lightest complete rain insurance most kits will ever carry.
Strengths
- Jacket and pants together weigh about 10 oz total
- Costs less than any single jacket here
- Surprisingly breathable nonwoven polypropylene
- Fully waterproof for stationary and light-duty use
Limitations
- Fabric tears easily; treat it as semi-disposable
- Fit is boxy and sizing runs large
- No features: no pit zips, minimal hood adjustment
| Weight (suit) | About 10.6 oz (jacket + pants) |
|---|---|
| Construction | Nonwoven polypropylene with micro-porous film |
| Includes | Jacket and bib-less rain pants |
| Venting | None |
| Features | Storm flap, adjustable hood, stuff sack |
Best for: Emergency kits, loaner gear, fishing, and anyone who needs dry-cheap insurance.
Skip if: You hike rough trails; the nonwoven fabric tears on brush and rock.
Step-up ultralight with venting
Marmot PreCip Eco
The classic value shell, updated with PFC-free NanoPro Eco coating.
At 10.1 oz the PreCip Eco is the heaviest pick on this page on purpose: it is what ultralight hikers graduate to when membrane-only breathing is not enough and pit zips become non-negotiable.
Strengths
- NanoPro Eco coating with a PFC-free DWR
- Pit zips at a budget price is rare and valuable
- Angel-Wing Movement cut allows real arm reach
- Frequently on sale well below list price
Limitations
- 2.5-layer PU coating breathes modestly and ages with use
- Interior coating can delaminate after years of storage
- Heavier than ultralight shells
| Weight (men's M) | 10.1 oz (286 g) |
|---|---|
| Construction | 2.5-layer NanoPro Eco PU coating |
| Face fabric | Recycled 30D nylon ripstop |
| Venting | Pit zips |
| Features | Roll-up hood, DriClime chin guard |
Best for: Budget hikers who want a proven brand-name shell with pit zips.
Skip if: You hike in all-day storms weekly; heavy users outgrow PU coatings faster.
Best Pertex all-rounder
Rab Downpour Plus 2.0
A fully featured Pertex Shield 2.5-layer shell for hiking and climbing.
Included as the honest durability step-up: at 13.2 oz it is not ultralight, but its Pertex Shield fabric and full features answer the fragility ultralight hikers complain about. Choose it when daily rain matters more than the lightest packed weight.
Strengths
- Pertex Shield 2.5-layer waterproof/breathable build
- Full feature set from a serious mountain brand
- Tougher face fabric than ultralight emergency shells
- Rab's hiking and climbing patterning fits active use
Limitations
- 13.2 oz is mid-weight, not ultralight
- 2.5-layer interior feels less plush than 3-layer shells
- Costs more than budget Pertex rivals
| Weight | 13.2 oz (375 g) |
|---|---|
| Construction | Pertex Shield 2.5-layer |
| Style | QWG78 |
| Pockets | 2 pockets |
| Features | Adjustable hood, stuffs into pocket |
Best for: Hikers who want full features and Pertex Shield durability in one shell.
Skip if: You count grams above all; true ultralight shells halve this weight.
Questions, answered
What if I need warmth too?
Then you do not need a lighter shell, you need a different system. An insulated rain jacket combines shell and insulation in one garment and suits cold, low-output days like spectating and camp chores. Active hikers usually do better with an uninsulated ultralight shell over a separate insulating layer, since the pairing vents, layers, and dries faster than one combined piece.
How light is too light?
Below about 5 oz, shells become fragile emergency-only gear with minimal hoods and zips. The 6 to 7 oz class, led by the Helium, is the lightest most hikers should plan real trail use around.
Ultralight jacket or rain poncho?
Ponchos ventilate better and cover a pack, but flap in wind and snag on brush. Ultralight jackets win on trail, wind, and camp use; ponchos remain a flat-route and bikepacking niche.
Will an ultralight shell survive a thru-hike?
Many do, with care around pack straps and rock. Expect the DWR to need refreshing mid-route and treat the fabric as the consumable it is; budget a replacement into a multi-thousand-mile plan.