Mens Octa Insulated Jacket (Petrol/Arctic Blue)

Colour: Petrol/Arctic Blue
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An incredibly versatile and light weight jacket, the OCTA offers great flexibility when you're just not sure what the weather will do, working perfectly on its own as well as being compact enough to be used as part of a layering system.

The Octa® Active Insulation lining is comprised of lightweight and stretchable filaments, delivering game changing performance without the associated weight penalty. Octa® insulation is designed to be absorbent, quick drying and provides excellent insulation with a soft and stretchy texture.

Venture out on your next adventure with confidence, the OCTA will take you BEYOND BOUNDARIES.

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  • 61% Recycled Polyester/39% Polyester outer fabric with PFC-free DWR (Durable Water Repellent) and wind repellent finish
  • 52% Recycled Polyester/48% Polyester OCTA® Active Insulation lining - offers flexible warmth & comfort performance on the move
  • Stretch elastic cuffs with thumb loops for a flexible fit
  • Vislon front zip
  • Zipped hand pockets with mesh lining - one doubles as a stuff sack
  • Elastic cord hem with adjusters at side seams
  • Stiffened peak on hood with Fjern logo
  • Side panel and underarm gusset to aid freedom of movement
  • Corded zipper pulls are easy to grab, even whilst wearing gloves
  • Adjustable drawcord hem
  • Hanging loop
  • Approximate garment weight: 295gms (size Medium)

  • Outer: 61% Recycled Polyester/39% Polyester
  • OCTA insulation: 52% Recycled Polyester, 48% Polyester
Size chart

Mens Jackets & Tops

Regular / Athletic Fit

Chest 90-95 96-100 101-106 107-111 112-117
Waist 74-78 79-83 84-88 89-93 94-99

The above chart indicates body measurements, not garment dimensions.
Calculate your own body measurements, then select the appropriate product size.
If your body measurements are between sizes, go down to the smaller size for a tighter fit, or up to the larger size for a more relaxed fit.

Size Chest (cm) Length (cm) Hem (cm) Sleeve Length (cm)
S 54 67.5 52 79.5
M 56 69 54 81
L 58 70.5 56 82.5
XL 60 72 58 84
XXL 62 73.5 60 85.5

Measurements are taken whilst garment is laid flat on a surface to aid comparison with your own garments.


  • Free shipping for UK orders over £50.
  • Free shipping for International orders over £100.
  • We aim to get UK orders to you within 2-5 working days. Delivery lead times for international orders vary.
  • For more information click here.


  • If you're not completely happy with your purchase, you can return an item within 100 days of receiving your order.
  • Items should be returned in the same condition in which you receive them: the original product packaging and tags must still be attached, and the products must be in an unused condition.
  • Please see full return instructions here.

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Customer Reviews

Based on 6 reviews
David Burns
Size: L
Height: 6'1 - 6'3
Fit: Kind of Small
Activity: Running
Recommend: No
Awful Jacket

I bought this jacket after it showed up in a search for waterproof running jackets, it’s certainly not waterproof and it is not water resistant either, and it’ll make you sweat profusely, worst jacket I’ve ever bought.

Thank you for taking the time to leave a review, David.

We are sorry to hear that the jacket did not meet your expectations in terms of waterproofing and comfort during active use.

The Octa Insulated Jacket is designed as a versatile and lightweight jacket, primarily focusing on providing insulation and flexibility. While it features a DWR finish, it is not a waterproof garment, and its insulated nature may not be ideal for high-intensity activities like running, where breathability and moisture management are key.

Wearing insulation while running can often lead to overheating, especially in milder conditions. The Octa Insulated Jacket is more suitable for colder conditions. However, for running scenarios where sweating and the need for waterproofing are concerns, this jacket may not be the best fit. Its construction is more aligned with providing warmth and comfort in cooler, less intense activities.

Please get in touch if you have any questions.

Kind regards,
The Fjern Team

Size: L
Height: 5'10 - 6'0
Fit: Kind of Small
Activity: Hiking
Recommend: Yes
Excellent jacket

I love this jacket. It is really light weight and packs very small, but still very warm and decent in a rain storm.

I'm 5 foot 10, narrow shoulders but preferred the fit of the large. I'd recommend a size up unless you want an extremely snug fit

Thank you for the feedback, Dan! We're pleased to hear that your Octa is performing well, and we appreciate your comments on the fit.

If you ever have any questions or require assistance, please feel free to get in touch.

Kind regards,
The Fjern Team

Dean Dahlgren
Size: M
Height: 5'10 - 6'0
Fit: True to Size
Activity: Hiking
Recommend: Yes
Really impressed

I was looking for an early morning late evening alternative to a fleece in the non winter months and this fits the bill nicely. Good level of warmth to weight factor, fit is good but sleeves could be a bit longer in my opinion for energetic sports like biking or climbing but this is my only criticism of a really good jacket. I am 183cm and do admittedly have really long arms. :)

Thank you for taking the time to share your positive experience with our Octa Jacket, Dean. We are happy to hear that it meets your needs for early morning & late evening temperatures. We appreciate your feedback regarding the sleeves being a bit short for some sports. This is something we try and incorporate into a number of our products, but as you mention - it can be tricky to get right for everyone. Thank you again for choosing our product and for sharing your valuable feedback with us.

Best regards,
The Fjern Team

Ken allen

Good design and comfortable feel.

Graeme McLean
Great Jacket

Really comfy, lightweight jacket, warmer than I thought it would be

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