9 Best Plus Size Thermal Underwear 2025 in the United States

The Cuddl Duds Thermal Underwear for Women is designed to keep you warm and comfortable during cold weather. Made from a blend of 93% Polyester and 7% Spandex, this thermal set provides a good balance of warmth and stretch. The brushed fleece interior offers extra coziness, while the matte soft exterior adds a stylish touch. This thermal wear is heavyweight, which can be beneficial for extreme cold but may feel a bit too warm for milder conditions.

The moisture-wicking fabric effectively absorbs and evaporates sweat, keeping you dry throughout the day. The spandex stretch ensures a snug fit, and the high elasticity accommodates a range of body movements, making it suitable for active wear as well as lounging. The design includes modern rise leggings and a thumbhole sleeve top, providing added comfort and functionality. Seams are designed to minimize chafing, enhancing overall wearability. For ease of maintenance, this set is machine washable.

While the sleek design makes it versatile enough to wear as a base layer or on its own, some users might find the set a bit bulky under tight-fitting clothes. The 50+ UV protection feature is a nice bonus for those spending time outdoors. However, the heavyweight nature and snug fit may not be ideal for everyone, particularly those who prefer looser or lighter layers. This thermal underwear set is an excellent choice for women looking for stylish and functional cold-weather clothing that offers complete comfort.

The Fruit of the Loom Women's Micro Waffle Premium Thermal Set in Black, size 4X, is crafted with a blend of 80% polyester and 20% cotton, ensuring softness and durability. The micro waffle fabric allows for a flexible fit, which is essential for comfort, especially in plus-size clothing.

This set is designed to keep you warm in cold to moderately cold conditions, making it suitable for winter wear or cooler climates. The polyester content typically aids in managing sweat, keeping you dry. The lack of tags is a thoughtful addition, reducing any discomfort from itching or irritation. Machine washability adds to the convenience of caring for this set.

Ideal for those seeking comfortable and warm plus-size thermal underwear, this set seems a good choice. More detailed information on certain specifications could enhance decision-making.

The COOTRY Plus Size Thermal Underwear for Women in Lace Black 3XL is designed to keep you warm and comfortable during the cold months. Made from a blend of 95% polyester and 5% spandex, this set features a cozy fleece lining and a lightweight design that avoids bulk. The material is breathable and stretchy, thanks to its Four-Way stretch technology, which ensures a snug fit and retains its shape over time.

This set includes a long sleeve top and full-length pants, making it versatile for both outdoor activities and daily wear at home. Available in sizes from X-Large to 4X-Large, it accommodates various body types comfortably. The moisture-wicking properties help keep you dry during physical activities, and the easy-care instructions allow for machine washing, which is convenient for regular use.

While the product offers warmth and comfort, it may not be suitable for those preferring natural fabrics over synthetic blends. Additionally, the seams and elasticity seem well-designed for plus-size figures, providing a secure fit without feeling restrictive. This thermal underwear set could be an excellent choice for women seeking warmth without sacrificing mobility or comfort during winter activities.