Kelvin Active Jacket

Kelvin Active Jacket

Big Game : Open Country
(10 Reviews)

The Kelvin Active Jacket is a versatile tool for backcountry pursuits. Featuring 80-gram Polartec® Alpha insulation, it is the perfect quiet outer layer in mild temps or as an insulator layered under a shell when the mercury dives. A zippered chest pocket secures at-hand essentials and doubles as a stuff sack. Soft, silent and breathable, this workhorse knows no off-season.

  • Size:

Product is Performance Fit, designed for minimal layering.

We have received all of our inventory this season. If your size is out of stock, please check with a local retailer.


  • GORE™ OPTIFADE™ Concealment Open Country is scientifically optimized for engagement ranges of 50 yards and beyond at ground level in rocky terrain above the timber line.

  • Weight: 13.77 oz. // Size: L

  • Fabric: 20-Denier Nylon Ripstop Shell (40-Gram, 100% Nylon), Breathable Polyester Mesh Lining.

  • Insulation: 80 g/m2 Polartec® Alpha® Insulation.

  • Durable Water Repellent finish resists light precipitation and prevents the face fabric from wetting out.

  • Highly Breathable and Thermally Regulating: Polartec Alpha Active is a non-migrating lofted fleece insulation that offers superior breathability and moisture management.

  • Brushed Fleece Hand Zip Pockets and Interior Zip Chest Pocket: The zippered chest pocket secures your necessities and doubles as a stuff sack. Hand warmer pockets are lined with brushed fleece for added warmth.

  • Neck and Chin w/ Brushed Tricot Lining: The neck and chin are lined with a brushed tricot to prevent chafing and add warmth and comfort.

  • Polygiene® Odor Control Technology safely neutralizes odor caused from sweat.

Moisture Wicking



Same Product, other uses

Kelvin Active Jacket
Kelvin Active Jacket

Why We Made This

We found nothing existed between a fleece layer and loft insulation that met the demands of active cold-weather pursuits. Our solution was to create a high-performance insulating mid-layer with superior breathability for active pursuits. Constructed with a DWR-treated durable nylon face, the Kelvin Active Hoody can be worn as an outer layer in mild conditions or as a breathable, insulating mid-layer in the late season.

Product Comments

10 Reviews
Write a Comment
Reviewed On 10/03/2019

Fell in love with this jacket on my two-week Alaska hunt. Just such a great mid-layer piece, and wish I would have find it sooner!!! It's not overly heavy/thick, and with no hood, it is very non-obtrusive. The athletic fit is great, especially on the arms (specifically the forearms) as to not bunch up too much. Great to layer over LW Core Hoodie and under Kelvin vest or Stormfront during inclement weather for sure!

Carl Abrams
Reviewed On 10/26/2018

Love this jacket! I used the Kelvin Lite for years because most of my hunting doesn't involve bitter cold. While I had no complaints with the K Lite, the Kelvin Active improved on it. The fabric is nearly silent, it breathes well and the fit is great (the Tall version is the cat's meow for my frame). When I expect cool weather the Kelvin Active is either on my back or in my pack.

Reviewed On 09/16/2018

Awesome Jacket. super light and super warm, But doesn't overheat when you get to moving around

Joe Owens
Reviewed On 01/20/2018

Love the pattern and the design, very lightweight. But I think the sizing is a bit off. I'm 59", 170 pounds, and the medium fits so tight on my chest I can barely zip it. Also bought the mountain pants, and they are awesome.

Trevor Trehearne
Reviewed On 12/26/2017

Really lightweight but very warm nice fit. Except wish it was longer.

Reviewed On 12/24/2017

I want to start this review by saying I had very high expectations for this jacket. From what I had seen in videos and read this was supposed to be the ultimate insulation layer, keeps you warm when stationary, but breathes very well when active. Well upon receiving it the first thing I noticed was how lightweight/thin of a jacket it was this gave me my doubts. Then I had a chance to use it for a late season elk hunt in western Washington. 4 out of 4 stars! This did not disappoint at all! I put it on in the morning and never took it off. It was exactly what I was hoping for, can definitely feel the warmth when you're wearing it and is great under the Thunderhead jacket. I even wore it to sleep in for added warmth. But I never got too hot when wearing it solo or layered. Idk how they did it but it's great. The body is a little short but it was made this way so it isn't sticking out underneath other jackets when used as a layer. I'm 5'8" with athletic build and with Sitka performance fit I wear a large and this fit the same. Great jacket, I highly recommend it.

Reviewed On 11/13/2017

Just a regular dude here. The hype is real...Soft, quiet, drys quickly, and is lightweight. Makes a great pillow in the sleeping bag. It's almost like a really intense base layer in the sense that it's warm, but wicks away moisture. It's bizarre; no other jacket like it and I recommend you check it out.

Reviewed On 10/17/2017

Not sure how they do it. I have the Kelvin Lite, the Kelvin Ultra Down, and the Kelvin Active. All excellent pieces and all seem to be designed for something different. I didn't think it could get any better than the Kelvin Lite. Then the Kelvin Ultra Down came out. My absolute favorite piece. Being a little skeptical of their newest piece, the Kelvin Active jacket, I put it to the test. The previous pieces are mostly design for low activity to no activity. The Kelvin Active jacket somehow keeps you warm with low activity and vents heat during high activity without sweating. No clue how they do it but this jacket is a killer at have. Warmth without overheating.

Reviewed On 09/26/2017

This jacket is AWESOME! Was super excited about it when I tried it out at the Western Hunt Expo and it lived up to the hype. Wore it for two weeks while guiding wilderness hunts and it is probably my most favorite new piece of gear. Plenty warm as a stand alone outer layer even on cool mornings riding in on horse back and combined with decent rain gear, it's a perfect mid layer. Dries out quick and seems to help keep my base layer dried out as well. Going to be even better during the rifle seasons underneath my Jetstream jacket.

Jon Sica
Reviewed On 09/17/2017

This thing is awesome. You can go uphill all day, and never be too hot or too cold. Dries like a dream and makes a great pillow...what more could you ask?

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SITKA Gear - 07.26.2017

The Linguists

Few sounds in nature rival the bugle of a bull elk. Join nine-time World Elk Calling Champion Corey Jacobsen as he explores a hunting legacy with elk calling pioneers Larry D. Jones, Wayne Carlton, Rockie Jacobsen, and Will Primos.