12 Best Thermal Underwears in 2017

Winter has just settled in, and the freezing temperatures may prevent you from engaging in the activities you love doing most. Nonetheless, instead of being troubled by the cold, why not learn to live with it? You can aim at doing that by choosing the right garments.

For instance, the best thermal underwear will enable you to spend as much time outdoors as you please, without having to worry about the freezing temperatures.

On that note, we have created this guide to highlight the main features you should look for in such a piece of clothing. Concurrently, we provide you with 12 top options, and four evaluations of the products which have reached the top of our list.

Top 12 Thermal Underwear Comparison

DesignNameMaterial BlendComfortRating (1-5)
  1. Minus33 Merino Wool Men’s Kancamagus Midweight Bottom 100% Merino Wool 5/5 4.7
  2. Duofold Men’s Mid Weight Double-Layer Thermal Union Suit Inside Layer – 100% Cotton; Outer Layer – 65% Cotton, 25% Merino Wool, 10% Nylon 5/5 4.7
  3. Duofold Men’s Mid-Weight Moisture-Wicking Ankle-Length Layering Pant 60% Cotton, 40% Polyester 5/5 4.6
  4. Smartwool Women’s NTS Mid 250 Bottom – Past Season 100% Merino Wool 5/5 4.6
 5. Duofold Men’s Mid-Weight Varitherm Thermal Pant96% Polyester, 4% Spandex 5/5 4.5
  6. Cuddl Duds Women’s Climatesmart Long Sleeve Crew Shirt100% Polyester 5/5 4.5
  7. Under Armour Women’s ColdGear Compression Mock 87% Polyester, 13% Elastane 5/5 4.4
 8. Smartwool Men’s NTS Mid 250 Crew – Past Season 100% Merino Wool 4/5 4.4
 9. Duofold Men’s Mid Weight Varitherm Crew Neck Thermal Shirt 96% Polyester, 4% Spandex 5/5 4.4
  10. Minus33 Merino Wool Women’s Franconia Midweight Bottom 100% Merino Wool 5/5 4.3
 11. Cuddl Duds Women’s Winter Thermal Long underwear base layering set 54% Polyester, 46% Cotton 4/5 4.3
 12. Cuddl Duds Women’s Winter Thermal Long underwear base layering set 92% Polyester, 8% Spandex 4/5 3.9

What Makes Good Thermal Underwear?

It is implied that cold weather can become a major impediment when it comes to outdoors activities. Whether you’re into skiing, hiking, or you work outside, the best thermal underwear will keep you both warm and dry, which is crucial.

To maximize the benefits brought by thermal underwear, we advise you to look at the following features.

  • Comfort – It goes unspoken that the first thing you should look for when browsing for underwear is the level of support that the garment provides you. In other words, how does the fabric feel? Does it feel breathable, soft or stiff?

Considering that your underwear is the very first thing that comes in contact with your skin, comfort should be your priority.

  • Seams – The quality of the seams will maximize the longevity of your garment while boosting your comfort.

For instance, after reviewing various items, we noted that when the seams are a bit too pronounced, one may be troubled with rubbing issues; this applies particularly in the case of shoulder seams if you intend on wearing a backpack.

Concurrently, you should look at the seams around the ankle as well, especially if you plan on wearing the garment while skiing, since the bottom of the base layer reaches the boot. Bear in mind this: the more minimal the model, the more comfortable you’ll feel.

  • Fit – A base layer ought to have a fit that is trim enough as to enable you to layer, without being overly bulky so that it makes you feel uncomfortable. There are preferences in this area as well; some people would rather choose a tight garment while others prefer a looser one.

Of course, this also depends on the type of activities you plan on doing.

  • Style – Do you plan on wearing the garment under other clothes, or do you wish to wear it as such, as well? Depending on the style of the item, you can wear it as an athletic fashion accessory, and not only as underwear.

Should I Choose Synthetic Fabrics or Wool?

The variety of items we have included on our list is made of wool, cotton, and synthetic blends. Firstly, the main advantage to choosing wool over synthetic materials is its antimicrobial and antibacterial properties. Concurrently, such blends are naturally stretchy, which makes them fit well.

Distinct from synthetics, wool wicks sweat away and it provides better insulation.

On the other hand, synthetic blends will dry out significantly faster. On that note, outdoor athletes will find such fabric combinations more useful since they dry out quickly and pull sweat away.

As expected, synthetic garments are more affordable than wool blends.

Depending on the way in which you’ll use the undergarment, your best choice may be either wool or synthetic. This is the primary factor to bear in mind while shopping: your needs.

Top 4 Best Thermal Underwear Reviews

1. Minus33 Merino Wool Kancamagus Bottom

This is a high-quality, exclusive undergarment manufactured with top-quality Merino wool. As outlined above, this choice of fabric poses numerous benefits.

Firstly, they provide you with optimal ventilation while deterring the cold air from entering in direct contact with your skin.

The best thing about this garment is that it stays odorless; this feature is granted by the breathability of the merino wool.

Furthermore, we have found that the sizing is truly dependable, and it fits nicely even the tallest figures.

All in all, this is ideal for all sorts of activities; it will keep you warm and cozy at even the lowest temperatures.

2. Duofold Men’s Mid Weight Double-Layer Thermal Union Suit

This product is excellent for those searching for a body suit that keeps the cold at a distance.

Although this may not provide you with the same flexibility as separate undergarments, this will keep you warmer.

The material blend encompasses merino wool, cotton, and nylon, and the result is excellent. You enjoy breathability and warmth.

The maintenance of this union suit is also effortless; it dries out easier than items made entirely of merino wool. Also, after washing, the size of the item remained unaltered.

3. Duofold Moisture-Wicking Layering Pant

This undergarment will fit under your everyday wear without having a bulky appearance. This is a crucial feature when it comes to underwear.

You want it to keep you warm, but you don’t want it to be obvious that you’re wearing it. The high-quality stitching outlines the manufacturer’s attention to detail.

If you want to purchase a thick, soft, comfortable layering item for everyday wear, this is an excellent choice; and it comes at the right price, as well.

4. Smartwool Women’s NTS Mid 250 Bottom (Black) Small – Past Season

These are nothing like a typical, old-fashioned granny undergarment. On the contrary, they combine style with functionality, and the result is unmatched.

The waistband ensures one’s ultimate comfort and the fit is flattering. You can either wear these with dresses and skirts or underneath jeans and pants. They work either way perfectly. It’s a great thing that they are so versatile: you’ll get a lot of wear out of them.

Although they are made of merino wool, they feel soft on the skin; no need to think about itchiness, which is a common concern with this kind of material blends.

We also liked that the seam construction prevents any rubbing. Overall – this is a great, high-quality product.

In conclusion, irrespective of your preference when it comes to the best thermal underwear, you cannot go wrong if you select one of our recommendations.

That’s because we wanted to make the job easier for you by thoroughly reviewing each item before including it in our guide. Stay warm!