Walk into an Arc'teryx store and the price tags are not the only thing that can feel intimidating. Every jacket seems to have a Greek letter for a name and a pair of capital letters after it: Alpha SV, Beta AR, Atom SL, Gamma MX. To regulars it is a perfectly logical code. To everyone else it reads like a parts catalog.
The good news is that the system is simple once you know the two halves. Here is how Arc'teryx names its gear, what each family and letter code means, and how to use it to pick the right jacket, whether you are heading up a mountain or just across town.
Unknowndivide may earn a commission from purchases made through links in this guide.
First, where the name comes from
Arc'teryx was founded in 1989 by a crew of climbers in Vancouver, Canada, and started as a basement operation making climbing harnesses and packs. The name is a shortened form of Archaeopteryx lithographica, the fossil creature that links dinosaurs and birds, which is also the skeleton in the logo. According to Arc'teryx's own naming guide, it stands for the idea of accelerating evolution in outdoor gear. Today the brand is part of Amer Sports, but its design center is still in the Vancouver area, and the obsessive engineering is what turned its shells into status objects far from the mountains.
The two-part system
Most Arc'teryx product names have two parts. The family tells you what kind of garment it is and the activity it is built for. The modifier, the letter code, tells you how that particular version balances protection, durability, warmth and weight within the family. So an Alpha SV and an Alpha AR are cousins with the same purpose, but one is built for far nastier weather than the other.
The shell families
- Alpha. Built for climbing and alpinism: technical climbing, ice routes and high-alpine trips where storm protection and durability come first. Expect harness-compatible pockets and helmet-compatible hoods.
- Beta. The do-it-all family, for hiking, ski touring and general mountain travel, with a slightly roomier fit for layering. If you only buy one Arc'teryx shell, it is probably a Beta.
- Gamma. Softshells. Stretchy, breathable and abrasion resistant, they handle wind and light weather when you are moving hard, but they are not fully waterproof.
You will also still see Theta and Zeta on the resale market. Both were earlier waterproof lines that are no longer part of the current range, and their ideas live on in today's Beta jackets.
The insulation and layering families
- Atom. Synthetic insulation that keeps working when damp, with breathable side panels so you do not overheat. It works as a midlayer under a shell or on its own in mild weather.
- Proton. Breathable insulation for high-output days like ski touring and fast ascents, trading some wind protection for airflow.
- Cerium. Lightweight down for the most warmth at the least weight, with synthetic fill in the spots most likely to get wet.
- Thorium. Down-insulated midlayers with more durable warmth.
- Delta, Rho, Phase and Satoro. Fleece and base layers: Delta is air-permeable fleece, Rho a warm base layer, Phase a quick-dry base layer and Satoro merino wool.
- Norvan and Bora. Norvan is the trail running family, Bora is built for multi-day trekking.
The letter codes
- SV, Severe Weather. The most rugged, most protective version within a family, made for prolonged storms, high winds and exposed terrain.
- AR, All Round. The middle ground: high-performance weather protection with an emphasis on versatility across many activities.
- SL, Superlight. Minimal and packable, favoring low weight over durability. SL has replaced the older LT (Lightweight) label on many products, which is why the Atom LT you remember is now simply the Atom, with a separate Atom SL.
- IS, Insulated. Built-in insulation for warmth and weather protection.
- MX, Mixed Weather. Durable, breathable and stretchy, usually softshell, for changing conditions where full waterproofing is overkill.
- FL, Fast and Light. Minimal, light and high-performance, for moving quickly in variable conditions. You will see it on footwear like the Konseal FL approach shoe.
Put the two halves together and the names decode themselves. An Alpha SV is the expedition shell. A Beta AR Jacket is an all-round mountain shell that is equally at home on a ski tour or a wet commute. A Gamma MX is a softshell for mixed weather. And if you see no code at all, as on the Atom Hoody, you are looking at the standard, middle-of-the-range version of that family.
Veilance and System_A
Two collections sit outside the mountain system. Veilance is Arc'teryx's minimalist city line, described by the brand as "a system of essential forms designed for navigating urban environments", with technical fabrics hidden inside sharp, quiet tailoring. System_A, in the brand's words, merges outdoor technology with a city aesthetic and leans more toward streetwear. If you like the idea of Arc'teryx but will never rope up, these lines are worth a look, and they show how far the brand has traveled from the crag. It is the same crossover that made workwear like the Carhartt WIP OG Arcan jacket and trail gear like the Nike ACG Zegama Hike into everyday style, with technical gear becoming as hyped as anything in our guide to Supreme drops.
Buying smart
Arc'teryx gear is expensive, so match the code to how you will actually use it. Most people in a city do not need an SV shell, and a Beta or an Atom will cover far more days. If you want to spend less, the brand's ReBIRD program sells used gear through its own resale shop, and in the US and Canada its trade-in scheme gives you store credit worth 30 percent of the original retail price for eligible used gear. Arc'teryx also offers repairs and washing services, so a good jacket can stay in use for years. That focus on longevity is behind its new System 0 framework, which we covered in Arc'teryx System 0 solves for the landfill first. And for cold days, a light down layer like the Cerium Hoody packs into almost nothing.
More in our Sneakers & Style hub.
