Question 1

is this water proof

Rick, Arc'teryx Guest Services · Accepted Answer

Hello Jeremiah, thank you for your question. The Ossa 1/2 Zip Hoody is not waterproof. It is a lightweight, breathable windshell designed for summer hiking and high-exposure days, providing wind resistance, sun protection, and ventilation rather than waterproof protection. If you're looking for a lightweight waterproof option, we recommend exploring our GORE-TEX styles, such as the Beta SL Jacket, which is designed to provide reliable waterproof, windproof, and breathable weather protection. We hope this helps.

Question 2

Hi!  Can you comment on the durability of the nylon fabric used in the Ossa lineup?  I often hike with an Aerios 18 pack and wanted to know how this fabric would hold up against abrasion, pilling, etc.

Seymour, Arc'teryx Guest Services · Accepted Answer

Hi there, thanks for reaching out. The 30d recycled nylon stretch ripstop fabric used throughout the Ossa line is designed for active use on the mountain, including hiking with a pack like the Aerios 18 Backpack. While it is lightweight and breathable, the ripstop construction helps improve durability and abrasion resistance. Over time, you may see some signs of wear in high-friction areas, but the fabric is intended to balance comfort, mobility, and durability for hiking. We hope this helps!

Question 3

I see that it has DWR treatment, but would it saturate in the rain?

Luna · Accepted Answer

Hi there, thank you for your question. The fabric used on the Ossa 1/2 Zip Hoody was treated with FC0 DWR, which means it can shed light moisture and cause water to bead briefly in light rain. However, it is not designed to be a rain shell. The Ossa 1/2 Zip was designed as a lightweight, breathable, and packable layer for sun protection, offering a UPF 50+ rating. We hope this helps!

Question 4

How does the Medium OSSA fit compared to the ATOM SL in medium?

Seymour, Arc'teryx Guest Services · Accepted Answer

Hi there, thanks for reaching out. In a size M, the Ossa 1/2 Zip Hoody has a slightly roomier fit through the chest compared to the Atom SL Hoody, while the overall length is very similar between the two. The sleeve length on the Atom SL is just a touch longer. We've included the measurements below to help with your sizing decision:

Ossa 1/2 Zip Hoody 
Size M
Chest Width: 116.0 cm
Center Back Length: 71.2 cm
Sleeve Length from Center Back: 92.0 cm

Atom SL Hoody
Size M
Chest Width: 113.4 cm
Center Back Length: 71.5 cm
Sleeve Length from Center Back: 92.8 cm

Question 5

Bonjour, je voulais savoir si on pouvait le porter directement torse nu et s’il assurait dans ce cas une protection solaire de 50 SPF   ?

Helio, Arc'teryx Guest Services · Accepted Answer

Bonjour, merci pour votre question! Oui, la veste à capuche semi-zippée Ossa peut tout à fait être portée directement à la peau, sans t-shirt ou vêtement en dessous. Cela n’a aucun impact sur sa protection solaire. La veste offre une protection UPF 50+, qui reste identique avec ou sans un vêtement en dessous.

Question 6

How does this compare to the Cormac Sun Hoody in SPF and breath ability? Also curious how it performs during high output activities like trail running, thank you.

Helio, Arc'teryx Guest Services · Accepted Answer

Hi Zachary, thank you for your question! The Ossa 1/2 Zip Hoody has a UPF rating of 50+. While previous iterations of the Cormac Hoody also carried a 50+ UPF rating, the current (SS26) Cormac uses a lighter-weight fabric with a more open construction. This updated fabric has not been tested or certified to meet UPF standards. If you are comparing the SS26 Ossa to the SS26 Cormac, the Ossa would be the stronger option in terms of sun protection. We don’t assign a numerical breathability rating to our garments, as common tests (such as RET) can vary widely based on conditions and don’t reliably reflect real‑world use. That said, both the Ossa and the Cormac are designed to be highly breathable and will feel very similar in this regard. The Cormac, however, is more optimized for moisture/sweat management during high-output activities. The Ossa is designed specifically for warm, sunny conditions and offers lightweight comfort, great airflow, and packability. It's a great option for summer hiking, trail running, and other high-output activities in warmer weather. We hope this helps!

Question 7

Hi what are the pit to pit measurements and top to bottom measurements from the collar to the bottom hem of a size XS in inches?

Helio, Arc'teryx Guest Services · Accepted Answer

Hi there, thank you for reaching out. Here are the requested measurements for the Ossa 1/2 Zip Hoody in size XS in inches:

Pit to pit measurement: 20.4 
Center Front Length: 21.7 
Center Back Length: 26.5

We hope this helps!

Ossa 1/2 Zip Hoody Herren

Ossa 1/2 Zip Hoody Herren

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