Arc'teryx Beta LT Sizing Guide: Find Your Perfect Fit
One of the most common questions we get is: "What size Arc'teryx jacket should I buy?"
It's a good question. Arc'teryx sizing can be confusing, especially if you're buying online without trying it on first. And since outlet items can't always be returned as easily, getting the right size the first time matters.
In this guide, I'll break down everything you need to know about Beta LT sizing — including how it fits, what size to get, and how to make sure you get it right.
The Short Answer
For most people, buy your normal size. Arc'teryx's "regular" fit is true to size for most body types.
- •If you're between sizes, size up (especially if you plan on layering)
- •If you prefer a trimmer, more athletic fit, size down
- •If you're buying from the outlet, check the size chart before ordering
Arc'teryx Fit Types Explained
Arc'teryx uses three main fit types. Understanding these is key to choosing the right size.
Regular Fit (Beta LT, Atom LT, Solano)
This is the most common fit. It's designed to:
- •Layer comfortably over a base layer and light midlayer
- •Allow full range of motion without excess fabric
- •Work for most body types
If you're buying a Regular Fit jacket: Get your normal size.
Athletic Fit (Alpha SV, Alpha FL)
This is a trimmer, closer-to-body fit. It's designed for:
- •Technical activities where excess fabric is a liability
- •Layering over thin base layers only
- •Athletes who prefer a close fit
If you're buying an Athletic Fit jacket: If you're between sizes or want to layer thicker midlayers, size up.
Relaxed Fit (Some casual pieces)
This is a roomier fit. It's designed for:
- •Everyday wear
- •Layering over thicker midlayers
- •Comfort over technical performance
If you're buying a Relaxed Fit jacket: You might be able to size down, depending on your preference.
Beta LT Sizing: The Details
The Beta LT has a Regular Fit. Here's how it fits on different body types:
Men's Sizing
| Size | Chest | Waist | Sleeve | Recommended Height |
|---|---|---|---|---|
| XS | 33-35" | 27-29" | 32" | 5'4"-5'6" |
| S | 36-38" | 30-32" | 33" | 5'6"-5'8" |
| M | 39-41" | 33-35" | 34" | 5'8"-5'11" |
| L | 42-44" | 36-38" | 35" | 5'11"-6'1" |
| XL | 45-47" | 39-41" | 36" | 6'1"-6'3" |
| XXL | 48-50" | 42-44" | 37" | 6'3"+ |
Women's Sizing
| Size | Chest | Waist | Sleeve | Recommended Height |
|---|---|---|---|---|
| XS | 31-33" | 24-26" | 30" | 5'0"-5'3" |
| S | 34-36" | 27-29" | 31" | 5'3"-5'6" |
| M | 37-39" | 30-32" | 32" | 5'6"-5'9" |
| L | 40-42" | 33-35" | 33" | 5'9"-5'11" |
| XL | 43-45" | 36-38" | 34" | 5'11"+ |
How It Fits on Real People
I'm 5'10", 165 lbs, with a 40" chest and 33" waist. A Medium fits me perfectly.
Here's what I've observed from friends and readers:
- •5'7", 150 lbs → Small fits great
- •5'10", 165 lbs → Medium fits great (me)
- •6'0", 185 lbs → Large fits great
- •6'2", 210 lbs → XL fits great
If you're between sizes (e.g., 5'9" and 155 lbs — between S and M), consider:
- •Size S: Trim fit, less room for layering
- •Size M: Roomier, better for layering
Layering Considerations
The Beta LT is designed to fit over:
- •A base layer (thin merino or synthetic tee)
- •A light midlayer (Atom LT or similar)
If you plan on wearing thick midlayers (like a heavy fleece or a down jacket), you might need to size up.
What fits under a Beta LT in size Medium:
- •Base layer + Atom LT: ✅ Perfect
- •Base layer + Cerium LT: ✅ Fits, but slightly snug
- •Base layer + heavy fleece: ⚠️ Tight
- •Base layer + Gamma MX: ❌ Too tight
Common Sizing Mistakes
1. Sizing Down for a "Trim" Look
Don't do this with the Beta LT. It's already a Regular Fit — sizing down will make it too tight to layer properly.
If you want a trimmer fit, get the Alpha SV instead (which has an Athletic Fit).
2. Sizing Up for "More Room"
If you size up, the jacket will be too long in the sleeves and too loose in the body. It won't perform as well in wind and rain.
If you want a roomier fit, get the Beta AR (which has a slightly more generous cut).
3. Ignoring Sleeve Length
Arc'teryx sleeves tend to run long — this is intentional, for range of motion. Don't size down just because the sleeves feel long. They're supposed to cover your wrists when you reach overhead.
4. Not Considering Layering
Think about what you'll wear under the jacket. If you only wear a t-shirt underneath, your normal size is fine. If you wear thick midlayers, you might need to size up.
Tips for Buying from the Outlet
- 1Check the size chart before ordering — don't guess
- 2Measure yourself (chest, waist, sleeve) for the most accurate fit
- 3Know your layering plan — what will you wear underneath?
- 4Returns are free from the official outlet — but it's still faster to get it right the first time
- 5Popular sizes sell out fast — if your size is available at 30% off, consider grabbing it
Final Verdict
For most people, the Beta LT in your normal size will fit great. It's a well-proportioned jacket that works for a wide range of body types.
If you're between sizes, size up. It's better to have a little extra room than to be too tight.
And remember — Arc'teryx sizing is consistent across products. Once you know your size in one Arc'teryx jacket, you can usually buy the same size in other Arc'teryx jackets with confidence.
Ready to find a Beta LT in your size? [Browse our catalog](/brand/arcteryx) and set up a price alert — we'll notify you when your size goes on sale.