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Down Vs. Synthetic Jacket: 11 Talking Points

When it comes to staying warm in the great outdoors, choosing the right type of jacket is vital.

But, there is always a question of a down vs. synthetic jacket – which one is the best for me?

Well, some people prefer down due to better insulation. Other people prefer synthetic jackets because of their versatility.

In reality, whichever you choose both have pros and cons. 

If you’re not sure which type of insulation to choose, don’t worry. This article is going to help you make an informed decision that works best for your needs.

What Is Fill Power?

Fill power is a measurement that is used to determine the loft of down [1]. The loft is the amount of puff that the actual down feather has.

For instance, if a jacket is 900 fill, it has 900 cubic inches of loft, whereas a jacket with 700 fill power only creates 700 cubic inches of fill.

So you need more than 700 fill in a jacket to create the same warmth as 900 fill on a jacket because it fills less space, so typically, a 700 filled.

The jacket will be heavier because they need more feathers to fill that area than a 900 filled jacket.

In a nutshell, the higher the fill power, the more the jacket will be lighter and be warmer.

What Is Down Jacket?

Down Jacket

Down jackets are your typical adventurer hiking jacket. You’re going to see most people in backcountry down jackets have been around for quite some time.

You can usually spot them out because of the baffle design and the puffy look that these jackets tend to have.

There are two different types of down jackets. You can either get a goose-fill down jacket made of goose down or goose-feathers or a duck down jacket.

Duck-down jackets are typically a little bit cheaper. They’re going to have a lower fill power than goose down, which is going to be a little bit more expensive and have a higher fill power.

What Are Synthetic Jackets?

Synthetic Jacket

The most significant difference between synthetic jackets and down jacket is that synthetic has no down in them.

Instead of using natural insulation like a down feather, it uses a synthetic material that does the same thing.

It creates a loft to provide warmth from the outside to the inside. Most of them are the same – made out of synthetic material.

The thermal ball insulation mimics down, and it’s little bitty puffs of synthetic insulation. So it allows it to fill down.

Apex insulation is one big sheet that just kind of puffs up. There are different thicknesses of it so that you can create additional warmth within jackets.

The warmer you get with a synthetic jacket creates more weight which is opposite from down.

Down Vs. Synthetic Jacket: The Battles

Now, let’s talk about the 11 differences between synthetic jackets and down jackets and why you would want to use one over the other.

Higher Warmth To Weight Ratio: Down Wins 

Let’s start with the warmth to weight ratio. Nothing currently comes close to down. It is superior to any synthetic when it comes to warmth to weight ratio.

As for comparison, when all things being equal mean comparable jackets with comparable shells, fabrics, comparable liners, and with equivalent amounts of fill insulation, down is going to keep you warmer.

Back to the example above, if you have a 900 fill down jacket, it’s going to be pretty warm and pretty light versus something like a 700 fill or a synthetic jacket.

Compressibility: Down Wins 

The next thing I want to talk about quickly is compressibility. Down still wins out in terms of compressibility and also durability. 

The down can be compressed, and then it can loft back up. Most of these jackets will compress to a tiny size. It doesn’t take up that much room in your pack.

The synthetics haven’t upheld to compressing very well. Every time you squeeze a synthetic insulation jacket or sleeping bag you’re breaking the individual fibers.

Eventually, they start to lose a substantial amount of loft. 

Not all synthetic products or synthetic insulations break down as quickly as others, but it’s something to look at.

For example, Mammut Ajungilak Synthetic has better insulation than others.

Moisture Tolerance: Synthetic Wins

When you’re comparing synthetic insulation to down insulation, the biggest knock-on-down has been moisture tolerance.

There have been lots of new developments in the market on that. Historically once again, down has not done that well in the presence of moisture.

You’ve probably heard stories or know others have told you about down jackets or down sleeping bags which have become saturated to the point where the down cluster no longer maintains their loft.

They’ve collapsed, and at that point, your down jacket or your sleeping bag insulation isn’t doing much to keep you warm.

Breathability: Synthetic Wins

With synthetics, that’s always been their significant advantage over down. Synthetic insulation performs much better than down as in a humid or wet environment.

Yes, you’re going to get wet in one of two ways. 

Firstly, you can get wet from the outside: the elements, rain, or wet snow coming through your jacket’s face fabric and wetting up insulation.

Another way is that you also can get wet from the inside out, which is your body sweating or moving lots of moisture.

You need to migrate that moisture or move that moisture from next to your body out to the environment.

So if you have to move it through the insulation and that’s why breathability is so important.

Tendency To Lose Loft When Wet: Synthetic Wins

The downside with a down jacket is that when down feathers get wet, they lose their loft. Down feathers tend to clump together when they get wet.

They can’t create the loft to fill the space to keep the warmth inside of the jacket. When they do get wet, it takes a long time for them to dry out.

So what’s the solution?

One of the solutions is to waterproof the down jacket. I highly recommend Nikwax Softshell Cleaning & Waterproofing Pack because it helps restore water repellency and is easy to use.

Baffles: Synthetic Wins

The main reason synthetic jackets are better than down jackets is that they have no baffles. On a down jacket, you have baffles, and the baffles are little stitch lines.

The reason they are in there is that the down tends to fall and go wherever at once. 

To keep all the down in that space, they have to create a baffle or a stitch to make sure that it doesn’t fall into the jacket’s next section.

The stitch also creates a little bitty layer that wind can get through. With synthetic jackets, it usually is a one-piece synthetic; you don’t have that baffle.

You can stay warmer within your synthetic jackets.

Materials: Synthetic Wins

Another con of going with a down jacket would be material because the jackets use a duck down or a goose down feather.

That means they’re not precisely hypoallergenic. If you are vegan, you wouldn’t exactly want to wear a jacket made out of animal products.

This is where the synthetic materials win, hands down.

Versatility: Synthetic Wins

Unlike down jackets, the synthetic jacket is more versatile because they have better waterproofing. 

If you go hiking on trails, you know that you don’t have to worry about the weather. Whatever the weather is: hot, raining, snowing, wet or dry – you’re good with your synthetic jacket.

But with a down jacket, there’s a lot of times out where you’re hiking, and you know that it’s going to rain, you instantly want to take your jacket off and then stuff it back in your pack.

Then, you’re going to put your rain jacket on so your jacket doesn’t get wet. So you don’t have to worry about the clumping and then having to dry it out later.

Weight: Down Wins

Down feathers weigh nothing. The jackets tend to be pretty lightweight and more compressible than synthetic alone.

The reason why synthetic is slightly heavier than down is that the former has a higher weight-to-warmth ratio than down

That means it needs to be heavier to achieve the same warmth as down. The warmer you get with a synthetic jacket, the more material they use. That adds weight. 

If you’re looking at a synthetic jacket with the same warmth as a down jacket, the synthetic jacket will be heavier because they have to use more material to emulate what down can do.

Life Expectancy: Down Wins

Over time, both down and synthetic start to lose their loft. It starts to break down a little bit.

With synthetic material, the fibers in the synthetic insulation will eventually break down over time.

Then the jacket starts to lose its puff and get thinner. The synthetic jacket lost its loft and its puff, and it’s not quite as warm as it used to be.

On the other hand, with down jackets, your oils, skin, and dirt start collecting in the feathers. It makes them start to smush together.

You can usually take it, clean it and get the down to puff back up.

Price: Synthetic Wins

The down jackets tend to be pretty expensive, especially when you’re talking about the higher fill, lighter weight jackets.

Generally, the down jackets’ price can be close to $300 if not a little bit over. 

On the other hand, synthetic jackets have a friendly price tag. Thus, they are more prevalent among people who are on a budget.

The Comparison Table

In summary, here’s the quick comparison between down and synthetic jackets:

Points Down Synthetic
Higher Warmth To Weight Ratio  
Moisture Tolerance  
Tendency To Lose Loft When Wet  
Life Expectancy  

Conclusion: Which Jacket Should You Get?

It boils down to what environment you are going to be hiking or traveling in the most. Also, what type of usage are you planning on getting out of the jacket.

There are a ton of synthetic jackets and down jackets on the market. They’re all awesome. 

It just comes down to figuring out what you need, your price point, and how long you plan to use it.

If you’re going hiking, it’s better to use synthetic jackets on the trail because the environment is different in all regions of the country.

Sometimes, you’ll go out and hike in a more wet environment, and there are times you’ll be hiking in a more dry climate.

So a synthetic jacket makes sense because you know that you can take it anywhere.

But all that comes down to your personal use.


Hey there, my name is Mac, and I am the person behind this website. I love traveling, hiking, and camping. I created this site to share my knowledge of the essential gears for your outdoor activities. I hope this will help you. Read more about me .