400 vs 800 hunting boots

When it comes to gearing up for a hunt, one crucial decision hunters face is choosing between 400 and 800 hunting boots. These numbers represent grams of insulation, indicating the warmth and comfort the shoes provide.

But navigating the differences between these options can be daunting for both seasoned hunters and newcomers. Understanding the distinctions between 400- and 800-gram hunting boots is vital for ensuring comfort, performance, and a successful hunt. So, let’s explore the nuances of these two types of boots to help you make an informed choice for your next outdoor adventure.

Many of us are intrepid travellers who will not allow the winter’s chill to prevent us from going outside. But spending that time feeling as though we are chilled to the tips of our toes is not comfortable. That’s where insulated, toasty winter boots come into play. 

Heavy-duty winter outerwear is insulated with a substance called thinsulate. When worn with an insulated boot, it should keep your feet toasty and offer some additional cushioning. 

The main factor influencing your decision between the two is how cold it will be when you utilize them. For example, if you are at least somewhat active, a rated 400g can keep your feet warm down to 30 or 40°F (-1.1 to 4.4°C), whereas an 800g should keep you warm down to closer to 20°F (-6.7°C). 

To help you choose the best boot insulation option, we’ll break down Thinsulate and weigh the advantages and disadvantages of 400g and 800g boots in this brief article.

Describing Thinsulate

It’s a thin synthetic substance called Thinsulate, which 3M only recently began trademarking. In frigid temperatures, it serves as insulation for clothing and shoes. While there are other choices, ethylene propylene is one of the most popular synthetic insulates. Zylet, HeatSeeker, Primaloft, and Opti Warm are a few of these. 

Thinsulate functions by enclosing air molecules within the microfiber strands. One of the best insulators is air; it can prevent the warmth within from departing and prevent cooler outside air from continuing to enter. You will desire and require less insulation or a lighter weight in warmer weather. You will need extra insulation if you plan to camp in the cold.

Two Frequently Used Insulation Types

Shearling and Thinsulate are the two types of insulation most frequently found in boots intended for cold climates. 

As previously mentioned, Thinsulate is a synthetic material that is lightweight and durable, giving your boots additional stability, insulation, and cushioning. 

Shearling insulation, similar to Thinsulate but cozier, is another fantastic warming choice for your boots. The shoes are comfy and keep your feet warm even in inclement weather because of their soft, delicate fleece construction. 

These two products differ primarily because these boots are designed to be used daily. When used for rough activities, the Shearling insulation does not hold up because it is less resilient.

What is 400 gram Thinsulate?

A range of weight insulation is included with Thinsulate-insulated boots. The main comparison in this article is between 400g and 800g Thinsulate boots. They serve several functions. Thus, consider the shoes’ weighted insulation according to how you want to use them. 

The Thinsulate grams represent the insulation thickness within the boot rather than the total weight of the insulation. Some people may need clarification on how it is listed. For instance, one square meter of that Thinsulate weighs 400 grams in an insulated boot. Your boot will weigh significantly less than this because it won’t include a square meter. 

400 gram Thinsulate

Less heat can escape from a 400g Thinsulate boot than a 200g boot, but more than an 800g boot. Consequently, the insulation’s weight modifies the boot’s temperature rating. 

The degree to which you may use them is also affected by the density of the Thinsulate material, as higher-gram boots will be heavier and more restrictive in terms of movement. 

Even for light activity, a boot with 400 grams of Thinsulate is suitable for cold days and nights. They are excellent work boots as well.

What is 800 gram Thinsulate?

In colder climates, 800g of Thinsulate insulation in boots is more effective at keeping your feet warm than 400g. They work best when the temperature is nearly freezing and will keep your feet safe even when you’re not walking much. 

800 gram Thinsulate

Your boots will get heavier and less flexible as the insulation gets thicker as you reach 800g and higher. It’s crucial to realize this if you intend to use these as work boots.

When Is 400 G Thinsulate Appropriate?

If you want something you can wear all day in the winter, 400g Thinsulate boots are the finest option. They keep you warm while enabling you to continue using your entire range of motion. 

They can withstand temperatures as low as 40°F (-40 °C) but work best in conditions just above freezing. Kenetrek Mountain Extreme boots are a great example of 400g Insulated boots that are waterproofed for wet weather.

When Is 800 G Thinsulate Appropriate?

Boots reinforced with 800g of Thinsulate are designed for freezing weather. Even in freezing winter weather, they still permit sufficient mobility to serve as work boots, even though they start to restrict your range of motion. 

Although they are usually most helpful in frigid weather, boots with 800g Thinsulate insulation can be rated as low as -60°F (-51.1°C). For hikers, hunters, and outdoor enthusiasts, the Rocky Ranger Waterproof Boot is an excellent example of them. 

If the most crucial aspect of your boot is its temperature rating, it’s worth checking into an accurate Thinsulate temperature chart to figure out what’s best for you.


  1. What is the difference between 400 and 800-gram Thinsulate boots?

The difference lies in the insulation thickness: 400g boots provide less insulation than 800g boots, affecting warmth and mobility.

  1. When choosing between 400g and 800g Thinsulate boots, what should I consider?

Consider your activity level and the expected temperature range; 400g is suitable for milder conditions, while 800g is better for colder climates.

  1. How does Thinsulate insulation work in hunting boots?

Thinsulate traps air molecules within microfiber strands, providing insulation to retain warmth and prevent cold air from entering, enhancing comfort in varying weather conditions.

  1. Are 400g Thinsulate boots appropriate for all-day wear in winter?

Yes, 400g Thinsulate boots are ideal for prolonged wear in winter, offering warmth without restricting mobility, making them suitable for various activities.

  1. When should I opt for 800g Thinsulate boots?

Choose 800g Thinsulate boots for icy weather conditions, where maximum insulation is needed to keep feet warm, even though they may slightly restrict movement.

  1. What are some examples of boots with 400g and 800g Thinsulate insulation?

Examples include Kenetrek Mountain Extreme boots with 400g of insulation, suitable for cold but not extreme conditions, and Rocky Ranger Waterproof Boot with 800g of insulation, designed for frigid temperatures and outdoor activities.


Choosing between 400g and 800g Thinsulate hunting boots depends on various factors, such as the temperature conditions you’ll encounter, your level of activity, and personal preferences for mobility and weight. Both options offer excellent insulation properties, with 400g suitable for milder conditions and greater mobility. 

In comparison, 800g provides enhanced warmth for frigid climates at the expense of some flexibility. Ultimately, understanding your specific needs and the conditions you’ll face will help you make the best choice to ensure comfort and performance during your outdoor adventures.

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