10 Best Men's Thermal Long Sleeve Shirts 2026 in the United States

The Under Armour Men's ColdGear Armour Fitted Mock in Black/White is designed to keep you warm while offering good ventilation and a comfortable fit. It features dual-layer fabric with an ultra-warm brushed interior and a smooth, fast-drying exterior, which helps in regulating temperature efficiently. The stretch-mesh back and underarm panels add strategic ventilation without sacrificing warmth, making it an excellent choice for cold-weather activities.

Its 4-way stretch construction ensures that the shirt moves with you, enhancing comfort and flexibility. The material wicks sweat and dries quickly, which is a big plus if you tend to sweat during physical activities. The ergonomic design keeps seams away from high abrasion areas, reducing discomfort and skin irritation.

The mock neck provides added coverage and warmth around the neck, which is beneficial in colder environments. The dropped, shaped hem offers additional coverage without feeling restrictive. While the shirt is fitted, it is streamlined to ensure it's not too tight or too loose, which many might find very comfortable. However, some might find the fitted design less forgiving if they prefer a looser fit. Given its design and features, this thermal long sleeve shirt is ideal for active men who need reliable warmth and moisture management in cold weather.

The Fruit of the Loom Men's Recycled Waffle Thermal Crew Top offers a good blend of comfort and functionality for cold weather. Its fabric combines U.S.-sourced cotton with recycled polyester, creating a soft yet warm waffle-knit material that effectively traps body heat. The moisture-wicking technology is a strong point, helping to pull sweat away from the skin and keep you dry during active or prolonged wear.

The fit is snug but flexible, designed to layer well under outerwear without feeling bulky, which is ideal for staying warm without added weight. The shirt features flat seams and a tag-free neckline, minimizing irritation and making it comfortable for all-day use. Ribbed cuffs help lock in warmth and prevent sleeves from riding up, which adds to its protective qualities.

While the fabric blend balances warmth and breathability, those looking for ultra-lightweight or high-performance technical fabrics might find it less suited to intense outdoor activities. The neckline is a classic crew, which works well for layering but may not be preferred by those wanting a higher collar for extra neck warmth. This shirt serves as a solid choice for everyday cold-weather layering, especially for casual or workwear use where comfort and warmth are priorities without specialized features.

The Amazon Essentials Men's Regular-Fit Long-Sleeve Waffle Shirt in Charcoal and Large size is a practical choice for those seeking a versatile thermal shirt. Made from a blend of 60% cotton and 40% polyester, the material strikes a balance between softness and durability, making it comfortable to wear throughout the day.

The waffle texture enhances its thermal properties, trapping heat to keep you warm in colder weather. However, it may not be the best choice for extremely cold climates where thicker, heavier thermal wear is needed. The fit is regular, providing ample room through the shoulders, chest, and waist, which is great for layering but might not be snug enough for those seeking a tighter fit.

At 8 ounces, the shirt is lightweight, adding to its comfort but potentially affecting its ability to provide sufficient warmth on its own. The moisture-wicking capabilities of the fabric are not explicitly highlighted, so it might not be the best choice for high-intensity activities that cause significant sweating. The seams and construction seem to be well-executed, with ribbed trim at the neckline and sleeve cuffs adding a neat finish and three-button placket providing some styling options. The neckline features standard ribbed trim, which is comfortable but not particularly distinctive. In essence, this shirt is a reliable, everyday thermal option that excels in comfort and versatility, though it may not offer specialized performance for extreme cold or heavy activity.