10 Best Cotton Thermal Underwear 2025 in the United States

The Amazon Essentials Thermal Long Johns Underwear Set for Men offers a slim fit that hugs the body, which is great if you want something that layers easily under clothes without bulk. It's made from a cotton and polyester blend (60% cotton, 40% polyester), combining softness and breathability with some synthetic fiber benefits, like better moisture control compared to pure cotton. The waffle knit design helps with airflow, so it can keep you warm but prevent overheating.

At only 8 ounces, this set is lightweight, making it comfortable for all-day wear. The elastic waist and ribbed cuffs help keep the leggings snug in place without feeling too tight. Care is straightforward since it’s machine washable and can be tumble dried at low heat, which is convenient for regular use. However, because it is a slim fit, it might feel tight on those who prefer a looser fit or have a larger build.

While the cotton-poly blend improves moisture management, it won't wick sweat as effectively as some high-performance synthetic-only fabrics. The seams and construction seem standard, designed to withstand everyday wear but might not be reinforced for heavy-duty outdoor activities. This set represents a solid, affordable choice for men looking for comfortable, lightweight thermal underwear suited for daily cold weather use rather than intense physical activity or extreme conditions.

The Fruit of the Loom Men's Recycled Premium Waffle Thermal Underwear Long Johns Bottom offers a blend of U.S. sourced cotton and recycled polyester, which is beneficial for those looking for eco-friendly options. The material composition of 52% cotton and 48% polyester ensures a soft and comfortable feel, with the mini waffle fabric providing extra warmth and insulation suitable for cold to moderately cold conditions.

The product's moisture-wicking and quick-drying properties are particularly advantageous for keeping dry during physical activities or extended wear, enhancing comfort. The reinforced flat seam construction is a notable feature, offering durability and reducing irritation from seams, which is a common issue with thermal underwear. The fit is traditional full length, which might be appreciated by users looking for complete leg coverage.

However, users should be mindful of the potential variability in fit based on body type, as it is a pull-on style without additional closure adjustments. The care instructions are simple, requiring machine wash, which makes maintenance easy. Those looking for reliable warmth, comfort, and easy maintenance will find these long johns suitable for daily wear, especially in colder climates.

The Place and Street Men’s Cotton Thermal Underwear Set is designed with a 60% cotton and 40% polyester blend, offering a good balance between natural softness and synthetic durability. Its heavyweight waffle-knit fabric feels warm and breathable, making it suitable for cold weather while helping to manage moisture and reduce odor. The set includes a thermal shirt and pants with a functional fly, and the fabric’s stretchiness adds to comfort and fit, which tends to be true to size.

Thanks to the Multi-Wick technology, it keeps you dry by wicking away sweat, ideal for outdoor activities or everyday use in chilly conditions. The seams appear well-constructed, helping prevent irritation during movement. Care is relatively straightforward, but following washing instructions is important to maintain fabric quality. While the polyester boost improves durability and moisture control, it might slightly reduce the pure softness of cotton alone.

This thermal set fits well for men seeking reliable warmth and comfort in a breathable, durable garment without complicated care needs.