Question 1

Hi, May I know the back length, chest and hem circumference in cm for the M and L size? Thank you

Amelie, Arc'teryx Guest Services · Accepted Answer

Hello, thank you for your interest in the Proton Hoody. We'd be happy to provide the measurements you're looking for:
Size M: Back length: 77.1 cm, Chest circumference: 118.0 cm, Hem circumference (relaxed): 110.0 cm.
Size L: Back length: 79.6 cm, Chest circumference: 125.6 cm, Hem circumference (relaxed): 117.6 cm.
If you're deciding between sizes, please note that items purchased through Arc'teryx can be exchanged or returned within 30 days of purchase, provided they are in like-new condition with the tags still attached. We hope this helps!

Question 2

Will adding proton hoody over atom or even a shell be efficient in adding warmth or it doesn't do much compared to a belay jacket since this is a breathable piece? I have the proton hoody too big so it doesn't work for me as a mid layer

River, Arc'teryx Guest Services · Accepted Answer

Hello Yong, layering the Proton Hoody over an Atom or a shell will add some warmth, but not in the same way a true belay jacket would. The Proton is built as an air‑permeable midlayer, so it’s designed to release heat during movement rather than trap it. When you place it over another insulated piece — or over a shell — you’ll get a small bump in warmth from the extra synthetic insulation, but it won’t deliver the high level of heat retention you’d expect from a purpose‑built belay jacket. Since your Proton Hoody fits too large to function well as a midlayer, you may find that it doesn’t seal in warmth effectively when worn on top either. For situations where you need a significant boost in warmth while stationary, a dedicated belay‑weight insulated jacket will perform much better.

Question 3

Would the proton be a good jacket for running at -15C in the winter ? With just a  base layer tshirt or long sleeve? or too hot?

Seymour · Accepted Answer

Hi Joël, thanks for reaching out. The Proton Hoody provides breathable warmth for climbing and high-output mountain activities and features 80gsm Coreloft™ Compact insulation. That said, we do not rate our garments for temperature as there are too many factors that influence this result from person to person, and we recommend referring to our layering guide for more tips on staying warm: https://arcteryx.com/ca/en/shop/layering-guide/

Question 4

I'm curious what the chest, waist and hem lengths are for this vs the current Proton Hoody in size medium.  I had  two older Proton LT's  and the size was perfect.  The new version is way too baggy.  Curious if this is closer to the old Proton LT fit.

Helio, Arc'teryx Guest Services · Accepted Answer

Hi there, thank you for your question. Here are the size‑medium measurements for the current Proton Hoody compared to the older Proton LT Hoody. In recent years, the Proton LT was renamed to the Proton Hoody. While the overall design, materials, insulation, etc, are similar, there have been some updates to the fit. The previous Proton LT Hoody fits slightly smaller than the current Proton Hoody.

Proton Hoody Men's (X000008436)
Chest Width: 118cm
Waist Width: 108cm
Hem Width: 110cm

Proton LT Hoody Men's (X000006728)
Chest Width: 116cm
Waist Width: 106cm
Hem Width: 108cm

We hope this helps.

Question 5

Can this be made without a hood again? I need it without a hood for ice climbing and downhill skiing. I need it with a hood for alpine climbing. Both are necessary. thanks!

Helio, Arc'teryx Guest Services · Accepted Answer

Hi Serena, thank you for reaching out and sharing your input. At the moment, we do not have any immediate plans to offer a hoodless version of the Proton again. That said, we have passed on your comments to our team for future consideration as we continue to refine our line and product offerings. We understand how having a Proton without a hood can be useful for some users and in certain use cases, so we appreciate you pointing this out and sharing your input. If you’d like to stay updated on new releases and product developments, feel free to subscribe to the Arc’teryx newsletter.

Question 6

it would be practical to have a  color visible by cars (but not too flashy more neutral color for urban use)

Luna · Accepted Answer

Hi there, thank you for your question! The Proton Hoody was designed as breathable warmth for climbing and high-output mountain activities. All of this season’s colourways are currently available, but we are thrilled that you are checking out the Proton Hoody. We love keeping things fresh, so new colourways are released each year. If you’d like to be the first to know about new product drops and colours, we recommend signing up for our newsletter. It’s the best way to stay in the loop. We hope this helps!

Question 7

Do you make an exchange size, if its not a good fit?

Seymour · Accepted Answer

Hi Phen, thanks for reaching out. We do not offer exchanges for purchases on arcteryx.com. To find your way into a new product, you may return and repurchase your item(s) online or at your nearest Arc'teryx Brand Store. Standard return policies apply. Please visit our Returns & Refunds page to start the return process here: https://arcteryx.com/ca/en/help/returns

Question 8

la proton hoody est-elle plus chaude que l'atom hoody ?

Helio, Arc'teryx Guest Services · Accepted Answer

Bonjour, merci pour votre question! La Veste à capuche Proton utilise un isolant synthétique Coreloft™ Compact avec 60 g/m² (grammes par mètre carré) dans la capuche et les manches, et 80 g/m² dans le corps. De son côté, la Veste à capuche Atom utilise aussi un isolant Coreloft™, mais à 60 g/m², réparti uniformément sur l’ensemble du vêtement. Ainsi, la Veste Proton contient plus d’isolant que la Veste Atom. Plutôt que de classer ces vestes en termes de chaleur, nous soulignons que leur performance dépend de votre activité, du système de couches utilisé et de votre confort personnel. La Proton privilégie la respirabilité pour accompagner les efforts soutenus, alors que l’Atom offre une meilleure protection contre le vent. Deux approches différentes, mais toutes deux pensées comme couches intermédiaires polyvalentes et performantes. Nous espérons que cela vous aidera!

Question 9

is it good for winter/extreme cold?

Helio · Accepted Answer

Hi there, thank you for your question! The Proton Hoody Men's is designed as a breathable insulation layer for high-output activities in cold conditions. It features 80gsm Coreloft™ Compact synthetic insulation, which is designed to balance warmth and breathability. The air-permeable Fortius™ Air 20 face fabric and liner help regulate temperature and manage moisture during active use. While it offers solid warmth for its weight, the Proton Hoody is not intended as a standalone piece for extreme cold. For colder conditions, we recommend either layering over the Proton Hoody with a shell or down piece to boost insulation or considering other options better suited for severe cold, such as the Thorium SV Hoody: https://arcteryx.com/ca/en/shop/mens/thorium-sv-hoody-9896. For guidance on layering over the Proton Hoody, feel free to check out our layering guide: https://arcteryx.com/ca/en/shop/layering-guide/

Question 10

Hello, I just purchased a proton hoody few days ago and the zipper also gets caught every time I zip it through the neck area. The staff also tried other proton zipper and it had the same problem. Is this normal??

Sophie · Accepted Answer

Hello, thank you for reaching out! We're sorry to hear about the issue with your new Proton Hoody. That’s certainly not the experience we want anyone to have with their gear. We really appreciate you taking the time to test other units with our staff and share your observations. To help us look into this further, we recommend submitting a Product Service Request form. This will give our team a clearer picture of what’s happening and allow us to provide the right support. Your feedback is incredibly valuable, and we’ll be sure to share it with our product development team. We look forward to hearing from you and helping get this resolved! https://arcteryx.com/ca/en/help/product-service/service-request

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