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10 Best Women's Thermal Undergarments 2025 in the United States

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Our Top Picks

#1

Winner

Cuddl Duds Womens Thermal Underwear - Heavyweight Base Layer 2-Piece Set - Cozy Moisture-Wicking Long Johns - Winter Clothing - Boysenberry Purple - Medium

Rating
9.9
Chosen by1,455
Material
Weight
Fit

Most important from
2996 reviews

Material
The material feels durable and well-made, making it a great investment for your winter wardrobe.
Weight
The thermals are incredibly soft and comfortable, perfect for chilly days with fleece lining that provides excellent warmth without adding bulk.
Fit
The fit is just right—not too tight, but snug enough to keep the warmth in.

The Cuddl Duds Thermal Underwear for Women is designed to keep you warm during cold weather with its brushed fleece interior and soft exterior. The material, a blend of 93% Polyester and 7% Spandex, offers good stretch and a snug fit, making it comfortable for active wear. The heavyweight fabric ensures warmth without adding bulk, allowing for versatile wear either as a base layer or standalone piece.

The moisture-wicking feature is beneficial for maintaining dryness, while the UV protection adds an extra layer of safety for outdoor activities. The inclusion of thumbholes in the sleeves and a modern rise in the leggings enhance the fit and comfort further. However, some users might find the fit too snug if they prefer a looser wear. The seam construction is designed to reduce chafing, enhancing comfort.

With machine washable care instructions, maintaining this thermal set is straightforward. This product is best suited for those looking for reliable, stylish thermal wear that can be used for both outdoor activities and lounging at home.

Rating
9.9
Chosen by1,455
Material
Weight
Fit

Most important from
2996 reviews

Material
The material feels durable and well-made, making it a great investment for your winter wardrobe.
Weight
The thermals are incredibly soft and comfortable, perfect for chilly days with fleece lining that provides excellent warmth without adding bulk.
Fit
The fit is just right—not too tight, but snug enough to keep the warmth in.
#2

WEERTI Thermal Underwear for Women Long Johns with Fleece Lined, Base Layer Women Cold Weather Top Bottom Black

Rating
9.8
Material
Fit
Moisture-Wicking

Most important from
11886 reviews

Material
Great smooth fabric and true to size, perfect for staying warm in very cold weather.
Fit
The adjustable fit ensures these thermal pieces stay snug without being restrictive, allowing comfortable layering under any outfit—from casual jeans to winter coats.
Moisture-Wicking
Good for warmth when worn under additional clothes or used with a quilt, but also wicks away moisture, allowing exercise without overheating.

The WEERTI Thermal Underwear for Women is designed to keep you warm and comfortable in cold weather. Made from a blend of 92% soft polyester and 8% spandex with a fleece lining, it provides a good balance of warmth and flexibility. The material is lightweight, making it suitable for layering under other clothing without feeling bulky.

The snug fit helps in minimizing heat loss and provides a streamlined look, making it ideal for wearing under both casual and formal attire, or even as pajamas. The four-way stretch fabric ensures flexibility and freedom of movement, which is great for active users. The moisture-wicking feature is strong, effectively keeping you dry by transporting sweat away from the body.

This thermal underwear set is a solid choice for women seeking warmth, comfort, and flexibility in cold climates.

Rating
9.8
Material
Fit
Moisture-Wicking

Most important from
11886 reviews

Material
Great smooth fabric and true to size, perfect for staying warm in very cold weather.
Fit
The adjustable fit ensures these thermal pieces stay snug without being restrictive, allowing comfortable layering under any outfit—from casual jeans to winter coats.
Moisture-Wicking
Good for warmth when worn under additional clothes or used with a quilt, but also wicks away moisture, allowing exercise without overheating.
#3

Thermajane Long Sleeve Thermal Shirts for Women Cold Weather, Womens Thermal Underwear Tops, Base Layer Women Thermal (Black, X-Large)

Rating
9.6
Material
Weight
Fit

Most important from
6988 reviews

Material
Cozy feel, perfect for casual wear and well-made.
Weight
Lightweight but the fleece inside really keeps you warm, ideal for chilly mornings.
Fit
Great for activities like golf, providing warmth without bulk.

The Thermajane Long Sleeve Thermal Shirts for Women offer several advantages as a base layer for cold weather. Made from a blend of 92% polyester and 8% spandex, they provide a soft and stretchable fit, which ensures comfort and flexibility. The fleece lining adds extra softness and warmth, making these shirts ideal for retaining body heat during cold days.

The moisture-wicking properties keep you dry and odor-free throughout the day, which is beneficial for various activities, whether at home or work. Additionally, the elastic closure type enhances the snug fit, preventing heat loss and adding to the comfort. The 4-way stretch fabric allows for free movement, which is a great feature for women who are active or on the go.

On the downside, since these thermal shirts are imported from China, some users may have concerns about the environmental impact or prefer locally made products. Nevertheless, with its excellent heat retention, softness, and moisture-wicking capabilities, the Thermajane thermal top is a solid choice for women seeking a reliable base layer in cold weather.

Rating
9.6
Material
Weight
Fit

Most important from
6988 reviews

Material
Cozy feel, perfect for casual wear and well-made.
Weight
Lightweight but the fleece inside really keeps you warm, ideal for chilly mornings.
Fit
Great for activities like golf, providing warmth without bulk.

Buying Guide for the Best Women's Thermal Undergarments

When it comes to choosing women's thermal undergarments, it's important to consider a few key factors to ensure you stay warm and comfortable in cold weather. Thermal undergarments are designed to provide insulation and retain body heat, making them essential for outdoor activities, winter sports, or simply staying cozy during chilly days. Here are some key specifications to look out for when selecting the best thermal undergarments for your needs.
MaterialThe material of thermal undergarments is crucial because it determines how well the garment will insulate and wick moisture away from your skin. Common materials include wool, synthetic fibers, and blends. Wool, especially merino wool, is excellent for warmth and moisture-wicking but can be more expensive. Synthetic fibers like polyester are good for moisture-wicking and are often more affordable. Blends combine the benefits of both. Choose wool if you need maximum warmth and comfort, synthetics for active use and affordability, and blends for a balance of both.
WeightThermal undergarments come in different weights, which indicate the thickness and warmth of the fabric. Lightweight thermals are suitable for mild cold and high-activity levels, as they provide some warmth without causing overheating. Midweight thermals offer more insulation and are versatile for a range of activities and temperatures. Heavyweight thermals provide maximum warmth and are ideal for extremely cold conditions or low-activity levels. Select lightweight for mild conditions or high activity, midweight for moderate cold and versatility, and heavyweight for extreme cold or low activity.
FitThe fit of thermal undergarments affects both comfort and performance. A snug fit is essential for effective insulation and moisture-wicking, as it ensures the fabric stays close to your skin. However, it should not be too tight to restrict movement or cause discomfort. Look for a fit that is close to the body but allows for a full range of motion. If you plan to layer other clothing on top, ensure the thermals are not too bulky. Choose a snug but comfortable fit for optimal performance.
Moisture-WickingMoisture-wicking properties are important to keep you dry and comfortable, especially during physical activities. This feature helps to draw sweat away from your skin and allows it to evaporate quickly. Materials like merino wool and certain synthetic fibers are known for their excellent moisture-wicking abilities. If you plan to engage in activities that cause you to sweat, prioritize thermals with good moisture-wicking properties to stay dry and avoid chills.
Odor ResistanceOdor resistance is a beneficial feature, particularly if you plan to wear your thermal undergarments for extended periods or during intense activities. Some materials, like merino wool, naturally resist odors, while others may have treatments to prevent bacterial growth. This feature helps keep you feeling fresh and reduces the need for frequent washing. If you need thermals for multi-day use or high-intensity activities, look for odor-resistant options.
Seam ConstructionThe construction of seams in thermal undergarments can impact comfort, especially if you wear them for long periods or during active pursuits. Flatlock seams are designed to lie flat against the skin, reducing the risk of chafing and irritation. Regular seams may be more noticeable and can cause discomfort. For maximum comfort, especially during physical activities, opt for thermals with flatlock seams.

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