Arcteryx Mens Cerium LT Hoody Black


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Other colours available:
Arcteryx Mens Cerium LT Hoody Black
Arcteryx Mens Cerium LT Hoody Labyrinth
Arcteryx Mens Cerium LT Hoody Shimizu

The Cerium LT Jacket is a high quality, super lightweight down jacket that can be used as an active mid layer or as a stand-alone jacket. It's ideal for mountaineering, backpacking, ski touring, climbing and more. 


Versatile high performance designs for diverse activities and conditions.


Streamlined, minimalist and lightweight technical down insulation. High warmth to weight ratio.


High performance, minimalist design that is durable for its weight.

Arcteryx Mens Cerium LT Hoody Black

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What is the Cerium LT?

The Cerium LT Jacket is a specialist lightweight down jacket that can be used as an active user’s winter mid layer or as a standalone piece in cold dry conditions. It weighs next to nothing, has clever mapped insulation and can be stuffed into its own stuff sack for easy storage.

What is it made of?

Insulation: Traditional down jackets are made lighter by simply reducing the amount of down and using super lightweight, fragile materials. Arc’teryx, however, have stuffed the Cerium with 850 fill power European Goose Down, therefore using less insulation but achieving the same warmth. Weight reduction has been achieved through ingenious engineering techniques. For example, the baffles on the elbows are narrower on the inside because your arm is naturally bent, so that area needs less fabric, the hem draw cords are reduced and only pull in the back of the jacket and the whole jacket is anatomically cut to reduce surplus fabrics. Arc’teryx have strategically placed Coreloft insulation in areas that receive the most moisture and are affected by compression. Therefore, the shoulders are Coreloft insulated as are the hem, sleeves, and underarms. This retains warmth even when wet and resists compression better than natural down. You get the best of both types of insulation, unrivalled warmth, and comfort from the down in the main body and protection from Coreloft in strategic areas.

Outer fabric: The outer is a 10-denier mini-rip ripstop nylon which has been treated with a DWR (durable water repellent), so it is tough (for its weight), wind resistant, highly breathable and has a smooth feel and soft handle.

What are the features?

Feature wise, you get an insulated, adjustable and helmet compatible StormHood, two zipped hand pockets, an internal zipped security pocket, an included stuffsack, an adjustable hem and an elasticated cuff.

How does it fit?

The Cerium LT fits into Arc'teryx's 'Trim' fit block. It features an average length, a trim body to trap as much warmth as possible and roomy shoulders to allow you to climb effectively without feeling restricted. You can fit light layers underneath if needs be, but size accordingly. 

Where does it fit in the layering system?

The Cerium LT can be used as a super warm midlayer in cold and damp conditions, or just as effectively as an outer layer in cold, dry conditions.

  • Extremely lightweight
  • Packable
  • Stuffsack included
  • High quality down insulation
  • Helmet compatible hood
  • Two hand pockets
  • One internal pocket
  • Trim fit
  • Elasticated cuffs
  • Adjustable hem
Code : 18013BLA

Season : 2020S R

Weight : 0KG

Sizing Information

Arc'teryx Men's Jackets & Shirts Sizing Information

Measurements refer to body size, not garment dimensions.

  Chest Waist Hip Sleeve
X-Small 36" 29" 36" 32"
Small 38" 31" 38" 33"
Medium 40" 33" 40" 34"
Large 43" 36" 43" 35"
X-Large 46" 39" 46" 36"
XX-Large 50" 43" 50" 37"
  Chest Waist Hip Sleeve
X-Small 92cm 74cm 92cm 81cm
Small 97cm 79cm 97cm 84cm
Medium 102cm 84cm 102cm 86cm
Large 110cm 94cm 110cm 89cm
X-Large 118cm 99cm 118cm 91cm
XX-Large 128cm 110cm 128cm 94cm

Next to Skin Fit: Cut snug to the body through the entire garment to enhance moisture management and thermal efficiency.

Slim Fit: Cut slim to the body through chest, waist, hip and thigh for a low profile fit.

Regular Fit: Cut comfortably from the body through bust/chest, waist, hip and thigh for a classic fit.

Relaxed Fit: Cut loosely through the waist, hip, and thigh for a casual fit.


Measure around your chest/bust, holding the measuring tape under your armpit.


Measure around your waist at the narrowest part.


From a standing position, measure from your crotch to your ankle.


With your arms in a slightly bent position, measure from the centre of the back of your neck, along the length of your arm, to the wrist.


Measure around your hips at the widest part.

Technical Information

Weight: 305g

Fabrics: Arato 10 (100% nylon)


- 850 fill European white goose down (102g)

- Coreloft 80 and 100

Centre back length: 72cm

Care & Advice

How to wash your down products

Having spent years talking to people about down products, whether that’s a jacket, sleeping bag or even a pair of slippers, very few have had the confidence to go ahead and wash the product on their own, especially when they have just spent an arm and a leg on it. This small guide is here to explain that it’s not as daunting and utterly terrifying as it first appears.

Step one: Before you even get near that washing machine, wipe off any excess mud or dirt that may be lingering on the surface of the jacket, as this will clog up the washing machine, eventually rendering it useless.

We recommend the use of Nikwax Down Wash Direct for down products as it’s one hundred percent environmentally friendly and will wash and re-proof the garment without the use of bleach or any other nasty chemicals. What household washing agents can (and often do) is remove the water repellent coating on the fabric of the jacket, whilst also damaging the delicate array of feathers inside.

Step two: We’ll assume in this instance that you’ve been washing other products prior to your down jacket and have used a bleach based detergent. Therefore it’s a good idea to run the washing machine for half an hour or so without anything inside to rinse it clean before adding the Nikwax or putting the jacket in. Also, don’t forget to remove the detergent drawer to give it a wash inside, outside and behind, as detergent can clog up and still enter the washing machine if not cleaned out thoroughly. This ensures that any remnants of detergent are removed and that the Nikwax products will work effectively.

Step three: Set the washing machine to a cold wash (check the garments care label, most tend to be around 30°C) and as delicate as possible. Most washing machines have a “wool” cycle which is ideal.

Step four: If using Nikwax Down Wash Direct, place 100ml in either the tray or directly into the washing machine inside a small pot/ball. If you choose to use another washing product, place the appropriate amount in the machine in the same way.

Step five: Set the washing machine to run on a slow cycle, allowing plenty of time for the jacket to soak up the cleaning/re-proofing product. Most washing machines will have a pre-set time for different washing cycles.

When the cycle has finished be prepared for a shock, your precious bit of kit will come out looking like a soggy ball of material. But don’t worry, you haven’t ruined it, it’s just that all that fluffy down insulation has become water logged and has clumped together. The trick is to now get all that down nice and dry to reinstate its superb insulating properties. Simply hanging it up in a warm place will not work that well. It will take days to properly dry and you will have to constantly break up the clumps to get it thoroughly dry. The best way is to use a tumble dryer; either a domestic one for smaller items or a commercial drier for sleeping bags.

Step six: Pop the garment into the dryer and make sure to select a low heat; a high heat runs the risk of melting seams and fabrics within the garment. It sounds weird, but shove a few tennis balls into the drier with the garment; the tennis balls will bounce around and help to break up the clumps of down. Every 20 minutes, pull the jacket out of the dryer and lie the jacket down on a table. Run your hands over the jacket until you find a 'clump' or ball of down; tease apart this down clump and spread it evenly into the baffle. Once you're confident you've pulled apart every clump to the best of your ability, stick it back in for another 20 minutes. Keep repeating this until there are no more clumps left. 

Step seven: When the cycle has finished and you are sure that you have got the garment as dry as possible, hang it up in a warm dry place, an airing cupboard is ideal, for 24 hours. This drives out the last of any dampness and allows the down to loft fully. Take it out and give it a good shake and, hey presto, it’ll be as good as new.


  • 5

    Reviewed by MAREK,  On 09/12/2017 07:26:25

    Great jacket, very light, you can roll it up completely so that it doesnt take up any space in your luggage, yet it provides a fair protection against elements. Ideal everyday item for British winters with temperatures around zero, you can combine it with other garments in colder climates.
    YES MAREK would recommend this item
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    Excellent customer service. Really detailed easy to understand product descriptions on the Trekitt website, and gear reviews on the Trekitt YouTube channel made it so easy to choose the right backpack for me.

    Emily - May 2020

    Amazing service! Very helpful in regards sizing and what most matched my needs, despite this being done over the internet. YouTube videos of products being examined are very useful also. Would definitely use again, very fast and efficient delivery. Brilliant! Highly recommended!

    David R - April 2020

    Highly recommend. I usually go to the shop in Hereford as staff are alwasy very helpful and knowledgeable. So this was the first time I have purchased online and the service was just as good as the shop.

    Grizzy - April 2020

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