Can't decide between the Beta SL Jacket and the Beta Jacket, lightness or price? Arc'teryx's Beta SL Jacket is the lightest of the Gore-Tex shells carrying the Beta name. Its former name was the Beta Lightweight Jacket. At 340 g, it still has underarm vent zippers and a helmet-compatible hood. It's a strong candidate for the rain jacket you keep in your pack through summer and fall. I've been torn between it and the Beta Jacket, and I haven't decided whether to buy yet. That said, I only picked this one up in a store around Oct 18. I haven't put it on, and I haven't used it in the mountains. I only looked at the sleeve length and the hood shape, and the numbers are the maker's published figures and my own calculations.
The Gear Nerd's Pick
It trims down to 340g with a thin 40-denier outer fabric, but it keeps the underarm vent zippers. If you get steamy on a climb, just open the pits. That's why, if I had to narrow my rain gear to one jacket to carry even on a clear forecast, I'd recommend the Beta SL.
Key points
- 340 g, ¥84,700. 35 g lighter than the Beta Jacket and ¥16,500 more
- Among the Beta jackets, the SL has pit zips. The Beta Jacket doesn't
- Per 1 day: 30 days a year for 5 years works out to ¥565
【Fall/Winter 2026】Arc'teryx Beta SL Jacket Review | 340 g, ¥84,700, vs the Beta
Beta SL Jacket weight and price: the lightest Beta at 340 g
The Beta SL Jacket (men's) costs ¥84,700 including tax and weighs 340 g. Model number X000010553. It's the renamed Beta Lightweight Jacket.
Inside is a 3-layer GORE-TEX ePE membrane, made without added PFAS, that blocks downpours and wind.
How I judged it
The first thing I compared was the 35 g difference from the Beta Jacket. The price goes up JPY 16,500, so it works out to JPY 471 for each gram saved. If weight were all that mattered, that's a tough call. The deciding point is the underarm vent zips. For rain gear you sweat in on climbs, comfort depends more on how well it lets the sweat out than on weight. I've been weighing it against the Beta Jacket and haven't decided. The reason I lean toward the Beta SL is that it's the only Beta at 340 g that lets you open the underarms.
Image: Rakuten Ichiba
Arc'teryx Beta SL Jacket Men's
For clothing, compare the maker's size chart (height, chest, waist) against your own size. If you are unsure, check the return and exchange terms on the shop's page.
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Beta SL Jacket specs
| Item | Beta SL Jacket Men's |
|---|---|
| Release date | Fall/Winter 2026 model (on sale) |
| Price (incl. tax) | ¥84,700 |
| Weight | 340g |
| Fabric | 3-layer GORE-TEX ePE (40×70 denier), C-KNIT backer |
| Hood | Helmet-compatible StormHood |
| Ventilation | Pit zips |
| Pockets | 2 zippered hand pockets, 1 internal chest pocket |
| Fit | Trim fit, 75 cm center back (M) |
How does it differ from the Beta Jacket and the Beta AR?
| Model | Weight | Price (incl. tax) | Per gram |
|---|---|---|---|
| Beta SL Jacket | 340g | ¥84,700 | ¥249 |
| Beta Jacket | 375g | ¥68,200 | ¥182 |
| Beta AR Jacket | 460g | ¥110,000 | ¥239 |
Against the Beta Jacket, the gap is 375 g − 340 g = 35 g and ¥84,700 − ¥68,200 = ¥16,500. The face fabric drops from 80 denier on the Beta Jacket to 40×70 denier on the SL. In return you get pit zips and a hood big enough for a helmet.
If you want tougher fabric for rocky terrain and winter, I compare it in the Beta AR Jacket review. To spend less and still wear the same GORE-TEX ePE, the Beta Jacket review is the closer choice.
Is there a women's Beta SL Jacket, and how is it different from the men's?
Yes, there is a women's model. It costs ¥84,700 including tax, the same as the men's, and weighs 300 g (men's: 340 g). Men's comes in XS to XXL and women's in XS to XL. The center back length is 75 cm for men's M and 70 cm for women's S (it varies by size). If you are tall or looking for a larger size, the men's, which has an XXL, is easier to choose.
Can the Beta SL Jacket be machine washed?
According to the official care label, it can be machine washed. Close all zippers and fasteners, wash warm, and rinse twice. Fabric softener and bleach are not allowed, and dry cleaning and ironing are prohibited. Do not leave it wet; take it out right after the cycle and wash it apart from other laundry. Dry it by warm tumble drying. The fabric is thin, so do keep to the rule of washing it apart from other laundry.
What I like
I'll say it plainly. 340 g with pit zips pays off most on summer peaks. Take a rain shell off and you get wet; keep it on and you steam. Open the pits and the steam gets out while the jacket stays on.
The front closes with a WaterTight zipper, lighter than a storm flap. The C-KNIT backer feels soft and stays less clammy over a T-shirt. It also carries a RECCO reflector that helps rescuers find you.
Its three layers of GORE-TEX ePE are the same as the Beta Jacket (375g), and it's 35g lighter. Even at this weight, the hood still fits over a helmet.
How does the Beta SL fit?
It's a trim fit, slimmer than the Beta Jacket (regular). Center back is 75 cm in M, versus 77 cm on the Beta Jacket. If you layer a thick insulated jacket underneath, try one size up too.
Things to watch
The face fabric is thin, so if it rubs hard against rock or a pack, the AR is the safer bet. Arc'teryx itself notes that the ePE face can feel damp. If it does, washing and drying it brings the water repellency back.
It costs ¥84,700, which is ¥16,500 more than the Beta Jacket. Saving 1g costs ¥471, so some people will find it pricey if weight is the only reason to buy.
What I learned handling it in a shop in October, and why I'm undecided
Around October 18, I picked up the Beta SL Jacket at a mountain gear shop. I did not put it on, so there is no size I wore; I only read the official back length of 75 cm for the M. I held it and spread it out for a few minutes, and what I checked was the sleeve length and the shape of the hood. I only looked at where the wrist would sit with the sleeve spread out, so I can't say how far the wrist comes out when the arm is extended. I moved the zipper and looked at the shape of the hood.
The fabric felt thin and gave a light impression. The cuffs and the zipper pulls looked slim and light. I did not pay attention to whether it has pit zips in the shop, so I will confirm that from the specifications.
What I am torn on is mostly the 16,500 yen difference from the Beta Jacket; the 35 g feels small. I hike on rainy days about six times a year, so the difference works out to about 2,750 yen per rainy day, which feels a little high.
On the Beta Jacket I wore in October 2025 (light rain turning to heavy rain, 5 m/s wind, about 6 hours), I opened the pit zips on the climb to let the moisture out. So before the SL's 35 g of lightness, I look at whether it has pit zips. If it can't vent moisture, it is hard to choose even if it is light.
I am concerned that the body-hugging Trim Fit would feel tight on a below-freezing winter day with an Atom Hoody (355 g) and fleece layered underneath. I have December in mind, at around -5°C. What I cannot praise is that I only handled it and am torn with the Beta Jacket without having decided. Whether to pay the 16,500 yen difference is the point I want you to think about before buying.
Who is it for?
It suits people who keep a rain shell in the pack for long stretches on summer and fall peaks. It also suits people who sweat on the climb and want to keep it on. If winter ridges are your main ground, the AR is another way to go.
It isn't cheap, but at 30 days of hiking a year for 5 years, ¥84,700 ÷ 150 days = ¥565 per 1 day.
How to choose the Beta SL Jacket, and my conclusion
I use 3 criteria: 1) weight (340g or 375g), 2) whether it has underarm vent zippers, 3) price (JPY 84,700 or JPY 68,200).
Conclusion: if you want to vent steam in summer to fall mountains, get the Beta SL Jacket. If you want to keep the price down, the Beta Jacket is enough. For how rain gear compares overall, see the rain jacket ranking.
About the writer and sources
I hike in Japan and abroad, and I'm a gear nerd who collects gear.
Published 2026-10-26 / Updated 2026-11-05. I checked the numbers on 2026/11/5. The source for each number is listed right below the table it appears in.
FAQ
How much does the Beta SL Jacket weigh?
The men's jacket weighs 340 g. The Beta Jacket is 375 g and the Beta AR is 460 g.
What's the difference between the Beta SL and the Beta Jacket?
The SL is 35 g lighter and adds pit zips and a helmet-compatible hood. It costs ¥16,500 more.
Is the Beta SL the same as the Beta Lightweight?
Yes. The Beta Lightweight Jacket was renamed the Beta SL.
Does the Beta SL Jacket come in a women's model?
Yes. The women's model costs ¥84,700 including tax, weighs 300 g and comes in sizes XS to XL.
Can the Beta SL Jacket be machine washed?
According to the official label, yes. Close the zippers, wash warm, rinse twice, and use no fabric softener or dry cleaning. Warm tumble drying is allowed.
Gear in this article
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Read next
- To compare within the same brand, read this too.Arc'teryx Beta AR Jacket Review
- For another pick from the same line, read this.Arc'teryx Beta Insulated Jacket Review
- To widen the choice within the brand, read this.Arc'teryx Beta Jacket Review
