10 Best Cold Weather Base Layer 2025 in the United States

The Under Armour Men's Armour HeatGear Compression Long-Sleeve T-Shirt is a solid choice for a cold-weather base layer. Made with 84% polyester and 16% elastane, this shirt offers a strong combination of flexibility and durability. The super-light HeatGear fabric provides excellent coverage while remaining lightweight, making it comfortable for extended wear. Additionally, the material is designed to wick sweat and dry quickly, which is essential for maintaining comfort during intense activities or workouts. The mesh underarm and back panels enhance breathability, preventing overheating even during strenuous exercise.

This can be particularly useful for layering in cold weather when you need to regulate body temperature effectively. The ergonomic design, which keeps seams away from high abrasion areas, is another thoughtful feature that improves durability and comfort. The hybrid raglan sleeve construction allows for a greater range of motion, which is important for physical activities that require flexibility.

However, the ultra-tight, second-skin fit may not be comfortable for everyone, especially those who prefer a looser fit. While the shirt is excellent at moisture-wicking and quick-drying, it is essential to consider that it may not provide sufficient insulation on its own in extremely cold conditions and would need to be paired with other layers. This product is machine washable, which is convenient for easy care. In summary, this Under Armour compression shirt is well-suited for those who need a reliable base layer for cold weather activities, offering comfort, durability, and moisture management. However, its tight fit and potential need for additional layers in very cold conditions are factors to keep in mind.

The Merino.tech Merino Wool Base Layer for Men offers a versatile choice for cold-weather activities with its midweight 250 g/m² option. This set includes both a top and long johns, along with a bonus pair of merino wool hiking socks, making it a good value purchase. The 100% merino wool material is praised for being super soft, providing all-day comfort without the itchiness that some wool garments can cause.

It naturally excels at moisture-wicking and odor resistance, keeping you dry and fresh throughout the day. The breathability of the fabric ensures good temperature regulation, making it suitable for various weather conditions. However, the care instructions recommend hand washing and air drying for longevity, which could be inconvenient for some.

Additionally, while merino wool is excellent for comfort and performance, it might not be as durable as synthetic materials, especially for those who plan to use it heavily. The fit is designed to be comfortable without overheating or bunching, but the exact fit may vary depending on body shape. This set is a great choice for those looking for a high-quality, comfortable, and functional base layer for cold weather, with the added benefit of receiving hiking socks. However, the care requirements and potential durability concerns are worth considering before purchase.