Leather Properties & Uses
How Warm Are Leather Jackets? What Makes One Warm and How to Choose for Your Winters
Leather mainly blocks wind; the lining and your layers do the insulating. Jacket types from unlined to shearling, why temperature charts disagree.
A leather jacket keeps you warm mostly by keeping wind off you. The lining, any fill and the layers under it do most of the insulating. Jacket sellers agree that leather blocks wind well but does not insulate much on its own.
So an unlined jacket suits cool, breezy days, and a shearling jacket sits at the warm end. Shearling jackets are known as the warmest flight jackets. This page is part of our hub on leather properties and uses.
What makes a leather jacket warm
Clothes keep you warm by holding still air in layers near your body. An outer layer that stops wind keeps that warm air from being swept away. Wind matters because it draws heat from the body.
Garment leather is thin: the store's quilted and lined jackets use hides of about 0.8-1.0 mm (0.03-0.04 in). At that thickness, the lining and layers likely carry most of the warmth.
| Part of the jacket | What it does for warmth | Source |
|---|---|---|
| Leather shell | Blocks wind, per jacket sellers; one store says its 0.9-1.0 mm (about 0.04 in) lamb leather "also helps block the wind" | – |
| Lining or fill | Holds the warm air; one store says most of a jacket's warmth comes from its zip-out Thinsulate liner | – |
| Shearling | Sheepskin with the wool left on, worn wool side in | – |
| Quilting | One store says stitched quilted panels add warmth | – |
| Fit and layers | Clothing squeezed tight insulates less where it presses | – |
| Water | Wet leather loses its thermal insulation | – |
How warm each type of leather jacket is
The warm leather jacket started in the air. Most WWI aircraft had open cockpits, and WWII bomber cabins were uninsulated, with temperatures down to -58°F (-50°C). The store's B-3 follows that classic flight-jacket shape, with a wide fur collar. More on hides for this style in the best leather for a bomber jacket.
| Jacket type | What it is | Where it fits |
|---|---|---|
| Unlined | Leather shell only; some custom jackets offer "No Lining" | Mild, breezy days, or over a sweater |
| Cotton or polyester lining | Thin lining, no fill | Cool days |
| Quilted | Stitched panels; most store quilted styles are 0.8-0.9 mm sheepskin | Cool to cold days with a layer |
| Insulated or zip-out liner | A fill such as Thinsulate that can be removed on mild days | Cold days over a shirt or thin sweater |
| Shearling (B-3 style) | Sheepskin with wool inside, wide fur collar; "warm and heavy" in the store's words | The coldest days |
Temperature guides disagree
Sellers publish temperature charts, and they don't match. None of them is based on a test we could find.
The gap between "54°F and up" and "41°F and up" is large. Treat any chart as a rough guide. We found no published insulation value (clo) for a leather jacket. Indoor reference tables put a lined suit jacket at only about 0.36-0.44 clo.
For leather as a cold-weather material in general, see leather in cold weather.
| Source (all sell jackets) | Leather jacket alone or lightly lined | Warmest option |
|---|---|---|
| Decrum | 54-68°F (12-20°C) alone; 23-41°F (-5 to 5°C) with full layers | Full layering under the jacket |
| Buffalo Jackson | 60°F (16°C) and up for a lightly lined jacket | Full shearling or down below 15°F (-9°C) |
| Rudsak | 41-60°F (5-15°C) for a standard leather jacket | Shearling, roughly 23-50°F (-5 to 10°C) |
Leather vs wool, down and fleece
- Wool holds air in its crimped fibers, which retains heat. One seller says wool coats insulate more in still air but let wind through.
- Down is warm and light, but loses almost all its warmth when wet.
- Fleece insulates and dries fast, but regular fleece is not windproof.
A leather shell over a wool or fleece mid layer combines a wind block with trapped air. For the full material comparison, see how leather compares with wool, down and fleece.
Rain, snow and a wet jacket
Leather can take up to 25% of its dry weight in water without feeling damp, and once wet it is hard to dry. Wet leather loses its insulation, and water replacing trapped air cuts the warmth of any clothing.
If your jacket gets wet, let it dry at room temperature and never put it in a dryer. More in wearing leather in the rain.
How to choose a warm leather jacket
- Pick the lining for your coldest days. Unlined or thin linings for mild weather; insulated or shearling for cold.
- Leave room for a layer. The store says a B-3 should feel roomy in the chest, and to measure over the layers you plan to wear. Tight clothing insulates less.
- Check how it closes. The classic A-2 flight jacket covered its zipper with wind flaps. A storm flap and a collar you can close keep wind out at the gaps.
- Want one jacket for all seasons? A zip-out liner lets you wear it on cold days and mild ones.
- Plan for wet days. Leather is not your best layer in steady rain.
For the coldest days, the Leather Collection B-3 shearling bomber is cut from 1.0-1.1 mm sheepskin with a shearling finish, a fur lining and a fur collar.
FAQ
Can I wear a leather jacket in October?
It depends on your local temperatures and wind. Seller guides put an unlined or lightly lined jacket at roughly 41-68°F (5-20°C), though they disagree on the lower limit.
Do leather jackets help with heat?
Leather passes some water vapor, which helps comfort. It does not make a jacket cool, so in heat a lighter or unlined build is the better pick. See is leather breathable? and, for legs, are leather pants warm?
How can you tell if a leather jacket is good quality?
Start with the hide and how it's made. A good product page names the leather it uses. Our guide on how to tell if a jacket is real leather covers labels and checks.
LeatherGuide Editorial Team
LeatherGuide articles are researched from published sources, cited in the text, and reviewed before publication.