4 Best Thermal Underwear Shorts 2025 in the United States

The Under Armour Men's Armour HeatGear Compression Shorts are designed with a blend of 84% Polyester and 16% Elastane, offering a lightweight yet durable material. The super-light HeatGear fabric ensures that the shorts provide excellent coverage without adding unnecessary weight. The ultra-tight, second-skin fit is ideal for those seeking compression for muscle support and enhanced performance.

The ergonomic design enhances durability by keeping seams away from high abrasion areas, reducing the risk of chafing during intense activities. Additionally, the updated gusset design adds to the comfort and support. One of the standout features is the moisture-wicking capability; the material efficiently wicks sweat and dries rapidly, making these shorts suitable for high-intensity workouts. Strategic mesh panels enhance ventilation in areas where it's most needed, further contributing to comfort.

The wide elastic waistband is both comfortable and functional, with the wordmark detail adding a touch of style. A convenient drop-in strength pocket on the right side is perfect for small item storage. These shorts are machine washable, adding to their ease of care. The Under Armour Men's Armour HeatGear Compression Shorts are best suited for athletes and fitness enthusiasts looking for lightweight, supportive, and moisture-wicking shorts for their workouts.

The DEVOPS Men's Compression Shorts Underwear is a versatile option for those seeking thermal underwear shorts. Made from 100% polyester, these shorts offer excellent moisture-wicking capabilities, pulling sweat away quickly to keep you dry and comfortable. This makes them suitable for all-season wear, whether in warm or cool conditions. The material is non-abrasive and includes spandex for a snug yet flexible fit, providing maximum mobility for various activities like gym workouts, running, or yoga.

The shorts also offer UPF 50+ sun protection, which is a bonus for outdoor activities. Weighing 8 ounces, they are lightweight and easy to wear without feeling cumbersome. The seam construction is designed to prevent chafing, adding to the comfort. However, being 100% polyester, they may not be as breathable as natural fabrics like cotton. The shorts come in a 3-pack and in different styles, including options with pockets for convenience.

These compression shorts are machine washable, which adds to their practicality for everyday use. Ideal for active individuals, they offer functional benefits and comfort.

The Fruit of the Loom Women's 2-Pack Micro Waffle Thermal Bottoms are designed to keep you warm in cold to moderately cold conditions. Made from a blend of U.S. sourced cotton and recycled polyester, the material is both soft and stretchy, providing a comfortable and snug fit.

The micro waffle fabric design helps to trap heat, especially with the addition of cuffed ankles which further ensure warmth. These leggings are imported from El Salvador and can be easily maintained with machine washing. Plus sizes are available, making it more inclusive for different body types.

These thermal bottoms are a good choice for those looking for comfortable and warm baselayer leggings.