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10 Best Thermal Underwear 2025 in the United States

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Our technology thoroughly searches through the online shopping world, reviewing hundreds of sites. We then process and analyze this information, updating in real-time to bring you the latest top-rated products. This way, you always get the best and most current options available.

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Our Top Picks

#1

Winner

Thermajohn Long Johns Thermal Underwear for Men Fleece Lined Base Layer Set for Cold Weather (Medium, Navy)

Rating
9.9
Chosen by1,454
Material
Fit
Durability

Most important from
56247 reviews

Material
Soft material and great stretch, ideal for wearing under work clothes without riding up.
Fit
Soft material and great stretch, ideal for wearing under work clothes without riding up.
Durability
So well-liked that users bought a second set, highlighting the product's reliability and effectiveness.

The Thermajohn Long Johns thermal underwear set is designed with cold weather in mind, making it a solid option for men looking for warmth and comfort. One of its standout features is the ultra-soft fleece lining, which ensures a cozy feel against the skin, enhancing the experience during chilly days. The material, made of 92% polyester and 8% spandex, offers a good balance of heat retention and flexibility, allowing for a comfortable fit without being restrictive. With its moisture-wicking capabilities, these long johns help keep you dry by drawing sweat away from the body, which is a big plus for anyone active outdoors. The 4-way stretch feature is also essential, as it allows for unrestricted movement, making these thermals suitable for various activities, from lounging at home to outdoor adventures.

There are a few considerations to keep in mind. While the fleece lining provides excellent warmth, it may be too warm for milder conditions, potentially leading to overheating if worn during less chilly weather. Additionally, the sizing may vary, so it’s advisable to check the fit before purchasing, as some users may find it runs a bit small. Durability over time also depends on the care it receives, given that it's machine washable; however, it’s wise to follow care instructions to maintain its quality.

The Thermajohn Long Johns are well-suited for individuals seeking reliable thermal underwear that combines warmth, comfort, and flexibility. They excel in cold weather settings but may not be the best choice for every temperature range. Ideal users would be those who require layering during winter activities or just want to stay warm at home.

Rating
9.9
Chosen by1,454
Material
Fit
Durability

Most important from
56247 reviews

Material
Soft material and great stretch, ideal for wearing under work clothes without riding up.
Fit
Soft material and great stretch, ideal for wearing under work clothes without riding up.
Durability
So well-liked that users bought a second set, highlighting the product's reliability and effectiveness.
#2

Thermajane Long Johns Thermal Underwear for Women Fleece Lined Base Layer Pajama Set Cold Weather (Medium, Black)

Rating
9.8
Material
Weight
Fit

Most important from
46927 reviews

Material
The thermal underwear feels incredibly soft and cozy, like being hugged by the lightest and fluffiest cloud.
Weight
It offers excellent warmth without bulk, making it easy to wear discreetly under clothes.
Fit
The fit is form-fitting yet never tight, with enough stretch to move comfortably throughout the day.
Moisture-Wicking
Moisture-wicking properties keep you dry and prevent overheating, maintaining a comfortable temperature in varying conditions.
Durability
Durability is strong, with no issues of holes or rips even after multiple wears and washes.

Thermajane Long Johns Thermal Underwear for women offers good warmth thanks to its fleece lining, which makes it soft and cozy against your skin. The fabric blend of polyester and spandex gives it a snug, stretchy fit that moves well with your body, making it comfortable for daily wear or layering in cold weather.

It also features moisture-wicking properties to keep you dry and odor-free, which is helpful if you’re active or wearing it for long hours. The material is lightweight yet designed to retain heat effectively without feeling bulky.

Since it’s mostly polyester, it might not feel as natural or breathable as some cotton or wool options, and durability could vary depending on how often you wash it. This thermal underwear is a practical choice for women looking for warmth, softness, and flexibility in a base layer, especially for casual or moderately active use.

Rating
9.8
Material
Weight
Fit

Most important from
46927 reviews

Material
The thermal underwear feels incredibly soft and cozy, like being hugged by the lightest and fluffiest cloud.
Weight
It offers excellent warmth without bulk, making it easy to wear discreetly under clothes.
Fit
The fit is form-fitting yet never tight, with enough stretch to move comfortably throughout the day.
Moisture-Wicking
Moisture-wicking properties keep you dry and prevent overheating, maintaining a comfortable temperature in varying conditions.
Durability
Durability is strong, with no issues of holes or rips even after multiple wears and washes.
#3

Amazon Essentials Thermal Long Johns Underwear Set for Men, Large, Navy

Rating
9.7
Material
Fit
Durability

Most important from
5147 reviews

Material
The fabric is notably soft and comfortable, providing warmth that doesn't feel heavy or restrictive.
Fit
The thermal set offers a perfect fit that hugs the body well, making it ideal for layering without bulk.
Durability
It maintains its size and quality after multiple washes, showing no signs of shrinking or pilling.

The Amazon Essentials Thermal Long Johns Set for men offers a slim fit that hugs the body well, making it suitable if you prefer a more tailored layer under your clothes. Made from a 60% cotton and 40% polyester blend, it balances softness and breathability, thanks to its waffle knit design. This material mix keeps you comfortable and provides lightweight warmth without feeling bulky. While it does a good job at basic moisture-wicking due to the polyester, it might not be the best choice for intense physical activity where high sweat management is needed.

The set includes elastic waistbands and ribbed cuffs that help keep the clothing snug and in place, which adds to comfort and warmth retention. Odor resistance is not a prominent feature, so if you’re looking for thermal underwear to wear repeatedly without washing, this might fall short compared to specialized fabrics with anti-odor treatments. Durability seems solid for everyday use, especially considering the affordable price, but it may not last as long as premium brands when subjected to heavy wear over time. This thermal set is a practical, budget-friendly option for everyday cold weather layering with a good fit and comfortable fabric, but it’s less suited for heavy sweating or long-term odor control.

Rating
9.7
Material
Fit
Durability

Most important from
5147 reviews

Material
The fabric is notably soft and comfortable, providing warmth that doesn't feel heavy or restrictive.
Fit
The thermal set offers a perfect fit that hugs the body well, making it ideal for layering without bulk.
Durability
It maintains its size and quality after multiple washes, showing no signs of shrinking or pilling.

Buying Guide for the Best Thermal Underwear

Choosing the right thermal underwear is essential for staying warm and comfortable in cold weather. Thermal underwear, also known as base layers, is designed to provide insulation and wick moisture away from your skin. When selecting thermal underwear, consider the material, weight, fit, and additional features to ensure you get the best product for your needs.
MaterialThe material of thermal underwear is crucial because it affects warmth, moisture-wicking ability, and comfort. Common materials include synthetic fabrics like polyester and nylon, natural fibers like merino wool, and blends. Synthetic fabrics are lightweight, quick-drying, and good at wicking moisture, making them ideal for high-intensity activities. Merino wool is excellent for warmth, odor resistance, and comfort, making it suitable for both active and casual wear. Blends combine the benefits of different materials. Choose a material based on your activity level and personal preference for comfort and warmth.
WeightThermal underwear comes in different weights: lightweight, midweight, and heavyweight. Lightweight thermal underwear is best for mild to cool conditions and high-intensity activities where you generate a lot of body heat. Midweight is versatile and suitable for a range of temperatures and activities, providing a balance of warmth and breathability. Heavyweight thermal underwear is designed for very cold conditions and low-intensity activities where maximum warmth is needed. Select the weight based on the climate you'll be in and the type of activities you'll be doing.
FitThe fit of thermal underwear is important for both comfort and performance. A snug fit is essential for effective moisture-wicking and insulation, as it helps trap body heat and move sweat away from your skin. However, it should not be too tight, as this can restrict movement and cause discomfort. Look for thermal underwear that fits close to your body without being constrictive. Consider your body shape and the type of outer layers you'll be wearing when choosing the fit.
Moisture-WickingMoisture-wicking is the ability of the fabric to draw sweat away from your skin and allow it to evaporate. This is important because it helps keep you dry and comfortable, preventing chills from damp fabric. Synthetic materials and merino wool are both good at wicking moisture. If you plan to engage in activities that cause you to sweat, prioritize thermal underwear with excellent moisture-wicking properties to stay dry and warm.
Odor ResistanceOdor resistance is a feature that helps keep your thermal underwear smelling fresh, even after prolonged use. Merino wool naturally resists odors, making it a great choice for multi-day wear or activities where you might not have the opportunity to wash your base layers frequently. Some synthetic fabrics are treated with antimicrobial agents to reduce odor. If you need thermal underwear for extended use or intense activities, consider options with good odor resistance.
DurabilityDurability refers to how well the thermal underwear holds up over time and with repeated use. High-quality materials and construction will ensure that your thermal underwear lasts longer and maintains its performance. Look for reinforced seams, high-quality stitching, and fabrics known for their durability. If you plan to use your thermal underwear frequently or in rugged conditions, prioritize durability to get the most value from your purchase.

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