Thermajohn Lightweight Tagless Thermals Set

Last updated: October 13, 2023

Thermajohn Lightweight Tagless Thermals Set

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We looked at the top Thermals and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Thermal you should buy.

Overall Take

These thermals are made of premium fleece fabric that keeps you warm, dry and fresh. They have strong seams that won't rip. The thermals are flexible and stretchy for full mobility.

In our analysis of 23 expert reviews, the Thermajohn Lightweight Tagless Thermals Set placed 1st when we looked at the top 6 products in the category. For the full ranking, see below.

From The Manufacturer

As the weather gets colder, you want to make you’re protected from the cold with mens long johns. They will keep you warm and dry with their moisture-wicking properties, and the snug fit will retain and distribute body heat for added warmth. You won’t have to worry about flexibility as these mens long underwear move with your body offering full mobility throughout your day. Staying active is essential and these thermals will serve you well throughout the day for all your winter activities or indoors for added comfort under your regular clothes. They can also be worn on their own as a pajama and as loungewear for when you stay home to watch the game.

Expert Reviews

What experts liked

Made from a poly-spandex material, the Thermajohn long underwear is decidedly lightweight, stretches easily, and offers full mobility no matter what your activity. It fits snug – almost like a second skin – but is soft.
We like these long johns because they’re comfortable and they work well for virtually any cold-weather scenario. There’s no need to find a pair of long johns that you have to change in and out of all the time!
Featherweight. Designed to be a four-way stretch. Thermajohn's slim fit design has excellent heat retention capabilities.
Won’t bunch. Due to the thin nature of the material these underwear are made from, the sleeves won’t bunch up like thicker clothes. This is great for people who like rolling up their sleeves while eating or other activities.
They are excellent for nearly any activity, whether indoors or outdoors. They are incredibly quick to dry, which will keep them from getting musty and damp under your ski pants and jacket. We love how they are incredibly soft and light, while still minimizing heat loss.

What experts didn't like

Check sizing carefully – they may run small.
Market is flooded with counterfeits.
Tight fit. Some may find that the tops of this underwear set fit rather tightly. This is especially true for those with a larger frame.
ome have complained that they can run small, in particular, the legs.


Whether you’re going to spend a day out skiing on the slopes, hiking in the brisk weather or working in the yard, wearing a good pair of thermals underneath your clothes is the key to being comfortable and warm. Thermals not only help your body heat stay at the right temperature, they are also good for wicking away moisture so your body feels dry.

When you’re looking to buy a set of thermals, begin by thinking about the function you want them to provide. For example, if you will be active while wearing the thermals, you may begin to sweat, so find a pair of thermals that is designed to wick away moisture to avoid feeling damp with sweat. Getting thermals that are stretchy is also key if you are going to be active, so that you have a full range of movement in your clothes. If you won’t be able to shower or change clothes frequently, such as when you’re on a hiking trip, then it’s important to find thermals with bacteria-resistance properties.

If you’ll be outside in particularly chilly temperatures, look for thermals that are made from heavy fabrics. Low-density weaves are important for trapping warm air close to your body to keep you toasty and insulated.

Synthetic materials such as polyester, lycra, nylon and spandex are mixed with natural fibers for thermals that can stand up to extremely cold weather. They can also wick away moisture while retaining heat. Thermal underwear that is made of wool is also a great fabric option for moisture-management.

If you’re going to be highly active in moderately cold weather, opt for thermals made from silk, which has a luxurious feel and soft texture. Cotton thermals are an affordable option, but they are not as warm as other fabrics, nor are they as good at wicking away moisture.

Buying Advice

  • Getting the perfect fit for your thermals is key. If it’s too tight, it will feel restrictive and it won’t provide a full range of movement. If it’s too loose, you will look bulky with a large layer underneath your clothes. Ideally, thermals should fit like a second skin, so that it insulates your body without having any extra fabric. A snug fit not only looks good under your clothes, it also traps heat that your body generates and doesn’t let it escape. This leaves you feeling warm and toasty in chilly conditions.
  • There are many different types of thermals, such as T-shirts, pants, long-sleeve shirts, briefs and even full-body suits. The type you need will depend on the function you want it to provide. Keep in mind that while one-piece suits are excellent at keeping you warm, they can be difficult to maneuver when you need to use the bathroom.
  • When buying thermals, comfort is of the utmost importance. Opt for thermals that don’t have seams or those with seams that sit completely flat. Because thermals are worn so close to the body, an abrasive seam can cause irritation on your skin if you’re wearing the thermals for an extended period of time.
  • If you haven’t worn thermals before, you may be wondering how they will fit under your pants. The key is to have a lightweight fabric that fits snugly on your body. Pull the thermal waist up above the waistline of your pants so that you can do up your pants with ease.