Question 1

Hi, Could you tell me the dimensions of the Practitioner for size L and XL. I am trying to decide the better fit for me. I am 6'1" and 210 lbs. I often wear size L in most brands.

Helio, Arc'teryx Guest Services · Accepted Answer

Hi Jay, thank you for reaching out. Here are the key dimensions for the Men's Practitioner AR Hoody in sizes L and XL:

Size L
Chest Width: 125cm
Waist Width: 117cm
Center Back Length: 76.5cm
Sleeve Length (from center back neck to shoulder point to bottom sleeve edge): 95.1cm

Size XL
Chest Width: 133cm
Waist Width: 125cm
Center Back Length: 79.1cm
Sleeve Length: 97.7cm

Please note that we offer free shipping and free returns within our authorized return window, so you’re welcome to order both sizes, try them on at home, and return any that don’t work—completely free of charge. We hope this helps!

Question 2

I understand that you have updated your sizes in the last 2 -3 years.  I have an old practitioner from several years ago in size small.  Is the size of this iteration smaller than the version I have?

Helio, Arc'teryx Guest Services · Accepted Answer

Hi Mike, thank you for reaching out about this. That is correct. In recent years, the men's fit has been updated with a revised fit. The medium size remains unchanged, while smaller sizes are now slightly tighter-fitting and larger sizes are now slightly looser. For your reference, here are the key measurements for the 2026 Practitioner AR Hoody in sizes Small and Medium:

Size Small
Chest Width: 112cm
Waist Width: 104cm
Center Back Length: 72.7cm
Sleeve Length (from center back neck to shoulder point to bottom sleeve edge): 90.1cm

Size Medium
Chest Width: 117cm
Waist Width: 109cm
Center Back Length: 74cm
Sleeve Length (from center back neck to shoulder point to bottom sleeve edge): 92.6cm

Additionally, here are the key measurements for the Practitioner AR Hoody Men's in size Small from the year 2019-2020 (several years ago):

Chest Width: 113cm
Waist Width: 105cm
Center Back Length: 72.2cm
Sleeve Length (from center back neck to shoulder point to bottom sleeve edge): 90.5cm

We hope this helps!

Question 3

I’m very interested in the Practitioner AR and have been a long-time Proton and Proton SL user. I noticed there is no men’s XS size available. Could you share the reason and whether XS may be offered in the future or specific time line for release?

Luna · Accepted Answer

Hi John, thank you for your question and for checking out the Practitioner AR Hoody! This is one of our PRO-exclusive insulated pieces, designed for durability, breathability, and enhanced mobility with its four-way stretch fabric. At this time, we don’t have visibility into how size availability is determined for each product, nor do we have information on whether an XS might be added in the future. We understand how important access to the right size is, especially for longtime Proton and Proton SL users like yourself, and we’ve shared your feedback with our design team for consideration. To stay up to date on product releases and any new size offerings, we recommend signing up for our newsletter. We hope this helps!

Question 4

Does the dwr on the Practioner have PFAS?

Dave · Accepted Answer

Hi Ryan, great question! The Practitioner AR Hoody features an FC0 DWR making it PFAS Compliant.

Question 5

where does this Jacket compare to the regular Proton and Proton SL as far as warmth and fit

Sophie · Accepted Answer

Hi there, thanks for your question! All three jackets, the Practitioner AR Hoody, Proton Hoody, and Proton SL Hoody, share a fitted cut designed to sit close to the body through the chest, waist, hip, and thigh. This streamlined profile minimizes bulk, enhances mobility, and layers comfortably over base layers or under shells. As for warmth and weight, the Proton SL Hoody is the lightest and most breathable (370 g), ideal for high-output activities and milder conditions. The Proton Hoody offers a balance of warmth and breathability at 415 g. Lastly, the Practitioner AR Hoody is the warmest of the three, weighing in at 475 g. However, it is designed to regulate moisture and warmth across varying activity levels and conditions, reducing the need for layering changes. Warmth can be subjective, so your intended use, activity level, and personal comfort in different climates are important considerations. We hope this comparison helps, and we are here to answer any further questions.

Question 6

Does this garment contain PFAS?

Dave · Accepted Answer

Hi Dave, great question! The Practitioner AR Hoody features an FC0 DWR coating making it PFAS (Per- and polyfluoroalkyl substances) Compliant.

Question 7

What is the difference in weight and fit between the practitioner and atom.

Seymour · Accepted Answer

Hi there, thanks for reaching out. The Practitioner AR Hoody weighs 475g in size M and has a fitted fit, while the Atom Hoody also features our fitted fit, it weighs a bit less at 355g.

Question 8

Hello,
I have the older version of the Practitioner AR size Small, but I ripped it. 
Can you tell me if the chest, waist, center front & center back measurements of old size Small and new size Small and new Size medium so I can compare the fit? Thx! 
Thx!

Seymour · Accepted Answer

Hi there, thanks for reaching out. The sizing of the Practitioner AR Hoody has remained consistent since Fall/Winter 2021. To help you make an informed choice, we’ve provided three key measurements below.

Size S
Chest Width: 112.0 cm
Center Back Length: 72.7 cm
Sleeve Length from Center Back: 90.1 cm

Size M
Chest Width: 117.0 cm
Center Back Length: 74.0 cm
Sleeve Length from Center Back: 92.6 cm

Question 9

Hi, Can you please explain the difference between Fortius 20, 50 and 1.0 soft shell? Thanks

Sophie · Accepted Answer

Hi Andy, great question! The material is Fortius 1.0, so that is consistent across both. The difference between the 20 and 50 refers to the denier count. A higher denier means more durability and abrasion resistance, but it also reduces breathability due to a tighter weave. We hope this clears things up.

Question 10

What is the current weight of the hydrophobic Octa® Loft liner in the Practioner AR?

Dave · Accepted Answer

Hi there, thanks for your question. The Practitioner AR Hoody features 98gsm of Octa® Loft insulation.

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