Best Long Underwear for Hiking (5 Pairs to Stay Warm)

Going hiking can be an adventure that you’ll never forget, but be careful because your memory could be a negative one if you’re not properly dressed. When hiking in cold weather, it’s vital to dress in sufficient layers. For this reason, you need to make sure to find the best long underwear for hiking.

Extreme Cold Weather Thermals: Fabrics

When it comes to finding the best long underwear for hiking, one of the first things you’ll be examining is the fabric of the potential base layer. While there are many factors that you need to be aware of during your search, the fabric is one of the most important ones because it decides many things about the way you will feel in your long underwear.

Before hitting the search trail, familiarize yourself with the following fabrics, which you are likely to come across:

  • Synthetic Fabrics: very tough and lightweight, long underwear made from synthetic fabrics can be counted on to dry quickly if you find yourself wet and cold. Try to wash them as often as possible to avoid a sweaty smell. The one thing to keep in mind about synthetic fabrics is that they do not hold as much heat as some other fabrics, which means that if you will be hiking in extremely cold temperatures, these will not be your best choice.
  • Silk: if you don’t like feeling bulky while layered up to stay warm, silk long underwear will work well for you. They don’t sit heavily under other clothes, but still manage to retain a substantial amount of heat. The main downside to silk is that it takes longer to dry, which will be difficult to deal with in the cold.
  • Merino Wool: for super cold temperatures, you want to invest in long underwear made from merino wool, as it does the best job at retaining heat, therefore keeping you nice and warm. It’s a breathable and odor resistant fabric, as well, the only thing you really need to be concerned about is being slightly more careful about wear and tear.

Now that you know a bit more about what fabrics you will be choosing from, it’s time to think about the other important dimensions of long underwear.

Choosing the Best Thermal Underwear Brand

Clothing preference is a largely personal thing, which is why it’s crucial to consider certain factors before you begin looking through different models of long underwear for your cold hike. Here’s what you should contemplate:

  • Warmth: this is a no-brainer, but remember, fabrics play a big role in how warm your long underwear will keep you. So, stay alert while you search.
  • Layering Practicality: don’t get caught thinking only about the long underwear, you need to be thinking about what layers you will be wearing over your long underwear. If you know your hiking pants are tighter, go with long underwear that is thin.
  • Comfort: imagine how you will feel wearing long underwear made from the fabric you choose and make sure you test them out before setting out to hike.
  • Breathability: you want to be warm, that’s true, but what you don’t want is to feel suffocated. You need long underwear that will allow for both.
  • Dry Well: whether it’s just from sweat, or from a combination of sweat and rain or snow, there is a good chance that your hiking pants and long underwear will get wet. Try to invest in a pair that will dry as quickly as possible, so you don’t stay cold longer than necessary.
  • Durability: hiking is a rough and tumbles activity, choose long underwear that can stand the pressure.

With just a few simple guiding factors, your search for cold weather long underwear will be a cinch.

5 Best Thermal Underwear for Extreme Cold

The time for deliberation is over, check out your 5 best options:

1. Duofold Men’s Mid-Weight Wicking Thermal Pant 

If you find yourself preparing for a hike in cold, but not freezing weather, consider trying the Duofold Men’s Thermal Pant. Made from a combination of polyester and cotton, these thermal pants are designed to keep you warm, while allowing for breathability, in combination with a moisture-wicking sweatband.

You never know when you will find yourself needing to change your hiking clothes altogether, but there’s no need to worry if you choose Duofold, as their thermal pants are affordable and available in a variety of colors, so you can stock up for your adventures.

2. Fruit of the Loom Men’s Classics Midweight Thermal Bottom 

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Another polyester and cotton combination, these thermal bottoms are made by a brand known for underwear in all its forms, Fruit of the Loom. Designed for ultimate comfort, these thermal bottoms have a tag-free and elastic waistband, wick moisture away so you stay dry, yet are durable and will last for many hiking trips over the years.

With these thermal bottoms, you’ll stay warm when you’re outside, and when you come back home, you can just put them in your washing machine for a quick cleaning.

3. Tesla Men’s Thermal Wintergear Compression Baselayer 

Made mainly from polyester, but sporting a fleece lining to keep you warm and toasty, these Tesla thermal bottoms are affordable, yet durable and flexible for a wide range of movement. With two-way air circulation and moisture sensing, your skin while breathe and your underwear will dry quickly when they get wet.

The extra compression fit is meant to make you feel secure as you hike, but if you want a looser fit, simply order a size larger than usual.


4. ColdPruf Men’s Platinum Dual Layer Bottom 

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Sliding these ColdPruf thermal bottoms on will feel like you are putting on your favorite pair of exercise pants since they are made from 100% CPT Performance polyester on the inside. Don’t let that fool you, though, the outside of these bottoms is made of 30% merino wool for real heat absorption.

Designed with no tags and comfort in mind, these bottoms will move with you through your hike.

5. Minus33 Merino Wool Men’s Kancamagus Midweight Bottom 

Look no further, if you’re preparing for a hike in extremely cold weather, as these Minus33 bottoms were designed with 100% merino wool for the sole purpose of keeping you warm, no matter what. These midweight bottoms protect against the cold without leaving you to feel suffocated or heavy. They’re reasonably priced and available in a variety of colors for you to choose from.






Final Thoughts

There’s no room for error when it comes to preparing for a hike in extremely cold weather, which is why you need to be on top of your long underwear game. Think about it in advance, consider what fabric best suits your needs, and find the right pair for you!


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