Carhartt has some new jackets this year, and here’s how warm they are.
If you just want the answer, here it is:
Quick answer
Warmest Carhartt jacket of 2025: Montana Loose Fit Insulated Jacket — warmth rating 1.89 (highest in our test set).
How this ranking works
Below is a ranking of new 2025 Carhartt outerwear using their measured warmth rating index. Higher number equals warmer. Items are listed warmest to least warm within this dataset. Use this as a guide to pick the warmest Carhartt jacket for your conditions.
Note: these are only the new jackets Carhartt offers. To see a complete list, reference the original Warmest Carhartt Jackets post.
Carhartt teamed up with the University of Michigan to test each jacket on a mannequin inside a temperature-controlled chamber. The images are pure nightmare fuel…
Warmest Carhartt jackets — 2025 ranking
Product links are provided for ease of use. These are affiliate links and I earn a small commission at no additional cost to you.
1) Montana Loose Fit Insulated Jacket — 1.89: Warmth Rating 4
Why buy: Heaviest warmth score in the group. Built for real cold where you may not be moving much: morning starts, night shifts, wind-exposed sites. This updated model has a new collar and fit details.
2) Flame Resistant Loose Fit Duck Insulated Active Jac — 1.76: Warmth Rating 3
Why buy: FR protection with serious insulation. Good for electrical, utility, or refinery work when cold and compliance are both non-negotiable.
3) Montana Loose Fit Washed Duck Active Jac — 1.71: Warmth Rating 3
Why buy: Active-Jac mobility with a high warmth score. Hooded coverage, classic work fit, tough duck shell.
3-Tie) Rugged Flex Relaxed Fit Lightweight Stretch Insulated Jacket — 1.71: Warmth Rating 3
Why buy: Flexible, wind and rainproof, the choice for active people who dont want anything too bulky.
4) Full Swing Loose Fit Washed Duck Insulated Active Jac — 1.7: Warmth Rating 3
Why buy: Flexible, wind and rainproof, the choice for active people who don’t want anything too bulky.
5) Loose Fit Denim Active Jac — 1.64: Warmth Rating 2
Why buy: One of the coolest color combinations in recent Carhartt history, with the familiar design of the Active Jac.
6) Rugged Flex Duck Fleece Lined Jacket — 1.52: Warmth Rating 1
Why buy: Stretch duck plus fleece comfort. Mid-cold days where mobility matters.
7) Loose Fit Waxed Cotton Active Jac — 1.50 Warmth Rating 1
Why buy: Waxed-cotton weather shedding with Active-Jac utility. This unique waxed material can also be washed, which is basically unheard of until now.
8) Relaxed Fit Jacket — 1.48 Warmth Rating 1
Why buy: Balanced warmth without the bulk. Works if you’re in and out of the truck all day.
9) Rugged Flex Duck Loose Fit Chore Coat — 1.45 Warmth Rating 1
Why buy: A classic for a reason. The Chore Coat is useful and easy to layer beneath for a versatile option that can hang in all climates.
10)Rugged Flex Duck Relaxed Fit Bomber Jacket — 1.42 Warmth Rating 1
Why buy: Lightweight layer for the transitional months, or early mornings/late nights.
Which Carhartt jacket should you buy?
- Coldest conditions: Montana Loose Fit Insulated Jacket.
- Need FR compliance: FR Loose Fit Duck Insulated Active Jac.
- Lots of movement: Rugged Flex Lightweight Stretch Insulated Jacket or Full Swing Washed Duck Insulated Active Jac.
- Everyday use: Relaxed Fit Jacket or Rugged Flex Duck Fleece Lined Jacket.
Full data table
| Item number | Carhartt product name | Warmth rating |
|---|---|---|
| 107082 | Montana Loose Fit Insulated Jacket | 1.89 |
| 107076 | Flame Resistant Loose Fit Duck Insulated Active Jac | 1.76 |
| 106975 | Montana Loose Fit Washed Duck Active Jac | 1.71 |
| 106981 | Rugged Flex® Relaxed Fit Lightweight Stretch Insulated Jacket | 1.71 |
| 106980 | Full Swing Loose Fit Washed Duck Insulated Active Jac | 1.70 |
| 106976 | Loose Fit Denim Active Jac | 1.64 |
| 107122 | Rugged Flex Duck Fleece Lined Jacket | 1.52 |
| 106977 | Loose Fit Waxed Cotton Active Jac | 1.50 |
| 106782 | Relaxed Fit Jacket | 1.48 |
| 106675 | Rugged Flex® Duck Loose Fit Chore Coat | 1.45 |
| 106781 | Rugged Flex® Duck Relaxed Fit Bomber Jacket | 1.42 |
FAQ: finding the warmest Carhartt jacket
What’s the warmest Carhartt jacket in this list? The Montana Loose Fit Insulated Jacket at 1.89. If you need pure heat, start there.
Does a higher warmth rating always mean better? Warmer isn’t always better if your job has high output or lots of climbing. If you overheat, step down to a lower rating with better mobility.
Is FR gear warm? FR pieces like the Flame Resistant Loose Fit Duck Insulated Active Jac can be very warm, but buy for compliance first and match insulation to your climate.
Sources
Official Carhartt product pages used to verify names and families for select items.
Carhartt was also kind enough to provide me their raw data used for warmth ratings to make this post/video.
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