Arc'teryx Cerium LT Hoody
"There are cheaper ways to keep your pack weight down but the Cerium LT Hoody is hands down the best piece of insulation I’ve ever worn."
Weight & Portability
Weather Resistance
Durability & Quality
Comfort & Style
Amazing warmth-to-weight ratio
Very stylish for a puffy
Amazing build quality
The price tag: ouch
No hydrophobic down

The Arc’teryx Cerium LT is a piece of gear so warm and light you’ll be able to brave exposed belay stations with just a base layer and barely notice it when stuffed away in your pack. The only problem? A price tag that’ll transform your wallet into a piece of ultralight kit as well.

It’s rare to be psyched when you see a massive cold front forecast for your next weekend of climbing. That’s because these were the conditions I needed to justify donning the Arc’teryx Cerium LT Hoody after it landed on my doorstep in early Autumn.

I just couldn’t wait to test it out in the colder conditions that I prefer for overnight hiking and climbing.

I wore this jacket over the course of 2 months, taking it on climbing trips to the Blue Mountains and Southern Highlands, car camping, a mid-winter overnight walk and a few chilly days around town. The temperature range was from 0ºc up to about 15-18ºc — any warmer than that and there was just no point wearing this bad boy.


arc'teryx cerium LT review, james stuart, jacket, camera, smoke, belay pitch


Filled with top-of-the-line, responsibly sourced, 850 fill-power down (and a small amount of synthetic Coreloft around the shoulders), slipping on the Arc’teryx Cerium LT brought instant warmth, no matter the situation.

On the south-facing walls of Sublime Point in the Blue Mountains, I pulled it on when belaying my partner on the classic multi-pitch Sweet Dreams. No sunlight? Cold breeze? Sub-5-degrees temperatures? No problems.

It was a welcome relief to slip this on after a cold night in the Royal National Park, where we slept through temperatures that dipped to around 3ºc. The hood kept my head toasty too.


arc'teryx cerium LT review, james stuart, jacket, camera, smoke, belay pitch

In all but the most extreme environments, the Cerium LT should keep you warm, especially with a bit of layering. Too warm, sometimes, as I found out, descending to the Sweet Dreams Wall. Within 5 or 10 minutes of moderate exertion, I was sweating like a pig and had to stop to take it off. An active layer, this is not.

Weight and Portability

Warmth to weight ratio is the main reason to buy the Arc’teryx Cerium LT: it’s hard to believe you can get so much toastiness for 305g. It compresses to about the size of a 1L Nalgene bottle, using a nifty pouch attached to an inner pocket.

It also has a handy loop for clipping off the back of your harness when climbing. I found it super convenient to scrunch up before setting off on a pitch of climbing, clip to my harness and then pull out again at the next belay station.


arc'teryx cerium LT review, james stuart, sweet dreams, climbing, gear, kit, carabiner, harness

Weather Resistance

The Arato 10 nylon shell is windproof — in frigid winds at Bardens Lookout crag in the Blue Mountains it kept me from freezing up until the sun finally hit the wall.

I wore it around Sydney’s Circular Quay one night as a cold south-westerly (with gusts of up to 60km/h) whipped across the water. I stayed perfectly comfortable with just a t-shirt as a base-layer.


arc'teryx cerium LT review, james stuart, fridge, dairy, down jacket

When it comes to water resistance, the story isn’t quite so rosy. The shell has a DWR coating that will repel light showers — the water beads nicely in light rain (as I found on a drizzly day in Mittagong). That’s important because down loses its loft and insulative qualities when wet.

The synthetic Coreloft insulation in the shoulder area mitigates this to some degree but using a hydrophobic down could have made this the perfect piece of gear.

Durability & Quality

The Cerium LT is an incredibly well-made piece of kit. If you were to draw up an outdoor gear pyramid, Canadian manufacturer Arc’teryx would sit somewhere up the top. But quality comes at a premium. In this case, it’s $580.

The shell fabric is thin so shouldn’t be worn off-track. That said, I ended up on the path less trodden after topping out Sweet Dreams and had to push my way through some thick bush.

Despite pokes by a few sharp sticks, the jacket held up a-ok. The experience was a bit nerve-wracking, however, and not recommended.

Comfort & Style

You’ll look the part in this jacket: it has a relatively casual fit (casual for a technical jacket, that is) that allows a good range of movement and means you won’t feel out of place walking around town or standing next to the dairy fridge in your local supermarket.

You won’t feel like an over-inflated tyre either, thanks to the high-loft down. The nylon shell felt surprisingly silky against my skin.


arc'teryx cerium LT review, james stuart, down jacket, sublime point, gopro, helmet

My main gripe is the hood: it’s pretty tight-fitting and looks a bit dicky. If you’re not into backcountry skiing, alpinism or climbing, you might be better off getting the non-hoody version and wearing a beanie which, granted, won’t keep your noggin’ as warm.

The hood also doesn’t fit over a climbing helmet, reducing its versatility somewhat. The waist cinch is a bit finicky though that didn’t really bother me.

Best Uses For The Arc’teryx Cerium LT

This jacket is a one-stop-shop for winter adventures. But do you need it? If you’re into multi-pitch climbing, lightweight hiking, alpinism, and backcountry skiing – pursuits where performance is critical – then it should definitely be on your shortlist.

It’s also worth considering as a stylish all-rounder if you live in colder parts of the world (I find the winters in Sydney just a bit too warm for a puffy most of the time).


Are you serious about getting outdoors in the colder months (and climates)? Do you value technical performance, quality, and weight above all else? Then run to your closest outdoor retailer and hand over your hard-earned money. Then keep on handing it over: the $580 price tag is about as steep as it gets for this market segment.

There are cheaper ways to keep your pack weight down but the Arc’teryx Cerium LT Hoody is hands down the best piece of insulation I’ve ever worn.


James was provided the Arc’teryx Cerium LT Hoody for review purposes and got to keep it. The views are entirely his own.