Best Thermal Base Layers for Men of 2025

Stay warm and comfortable with the Thermajohn Thermal Underwear. Designed with heat retention in mind, these long johns help protect you from the cold, making them perfect for winter outings. The ultra-soft fleece lining ensures you feel cozy throughout the day, whether you’re outside or relaxing at home. Plus, the breathable fabric effectively wicks away moisture, keeping you dry and comfortable even during physical activities. With a 4-way stretch, you can move freely without worrying about chafing or discomfort. Layering with these thermals is a smart choice for staying warm this season.

Stay warm and comfortable this winter with the Thermajohn Thermal Shirts for Men. Designed specifically for cold weather, these long sleeve shirts provide excellent heat retention to keep you protected from the chilly temperatures. The ultra soft fleece lining and quality material ensure all-day comfort, while the moisture-wicking fabric keeps you dry by effectively removing sweat. With its 4-way stretchable material, these thermal shirts allow for freedom of movement without chafing or bunching up. Whether you're outside or in bed, these base layer shirts are perfect for layering to ward off the cold. Stay cozy and stylish with the Thermajohn Thermal Shirts.

The Spyder Thermal Underwear Set is designed to keep you warm and comfortable during cold weather activities. With its advanced ThermoWeb technology, this set traps body heat, making it perfect for skiing or outdoor adventures. The moisture-wicking DryWeb technology ensures that sweat is pulled away from your skin, keeping you dry during intense activities. Plus, the flexible FlexWeb material allows for easy movement, so you can enjoy unrestricted mobility whether you're hitting the slopes or relaxing at home. This versatile set includes a long-sleeve shirt and pants, making it an essential addition to your winter wardrobe.

The 32 Degrees Baselayer Top is designed for comfort and warmth. Made from a lightweight knit fabric that combines polyester, acrylic, rayon, and spandex, it offers excellent stretch for a snug fit. This top is perfect for layering under your clothes, ensuring you stay warm without bulk. It also features easy care instructions, allowing you to wash it gently and tumble dry low. With a fitted design, it hugs your body comfortably, making it an ideal choice for outdoor activities or everyday wear.

Stay comfortable all day with Merino.tech Base Layer. Made of 100% Superfine 18.5 Micron Merino Wool, this midweight base layer is available in three options: Lightweight, Midweight, and Heavyweight. Its natural moisture-wicking properties keep you dry and fresh, while its soft and comfortable texture prevents rubbing, overheating, or bunching. You can easily care for it by washing it in the washer/dryer or hand wash and lay flat to air dry. With a lifetime warranty, you can trust that this base layer will perform to your satisfaction.

Stay warm and comfortable during cold weather with the Carhartt Thermal Base Layer Shirt. Made from a temperature-regulating wool-polyester blend, this shirt keeps you warm while also wicking away sweat with its fast dry feature. The rugged flex technology allows for ease of movement, making it perfect for outdoor activities. The smooth flat lock seams and tagless label enhance comfort, preventing any irritation on your skin. Additionally, the shirt features a convenient zip pocket on the chest for storing small items, and concealed thumb loops for added versatility. With its odor-fighting properties, this Carhartt Thermal Base Layer Shirt is a must-have for any man's wardrobe.

The Merino.tech Base Layer Set offers a midweight solution for your thermal underwear needs. Made from 100% superfine merino wool, this set ensures all-day comfort without any itchiness. Its moisture-wicking and odor-resistant properties keep you feeling dry and fresh, making it ideal for daily wear. The breathable design helps regulate your body temperature, so you can wear it comfortably throughout the year. Plus, with the bonus of free Merino wool hiking socks, this set is not only practical but also makes a great gift.

The OYGSieg Thermal Mock Neck is designed to keep you warm and comfortable during cold weather. Its mock turtleneck offers excellent protection against chilly winds, ensuring your neck stays cozy. The moisture-wicking fabric is perfect for everyday wear, as it quickly draws sweat away, keeping you dry all day long. With added spandex, this shirt fits snugly to your body, helping to retain heat without sacrificing comfort. Plus, its stylish look makes it a versatile choice for any occasion, whether you're indoors or out enjoying recreational activities.

The MEETYOO Thermal Underwear is designed to keep you comfortable and warm during outdoor activities. With its four-way stretch fabric, you can move freely without feeling restricted. The lightweight and soft material ensures warmth without bulk, making it ideal for cold weather. Additionally, the moisture-wicking properties help to absorb sweat and dry quickly, keeping you dry and comfortable while exercising. Whether you're skiing, hiking, or simply lounging at home, this thermal gear serves as a perfect base layer or cozy pajamas for chilly nights.

The ATHLIO Thermal Compression Shirt is designed to keep you warm during your winter workouts. With its soft fleece lining, it traps heat to ensure you stay comfortable in cold weather. The blend of polyester and spandex provides excellent stretch and durability, allowing for a full range of motion in activities like running, yoga, and sports. Additionally, it offers impressive sun protection, blocking over 99% of harmful UV rays, so you can enjoy outdoor activities without worry. Remember to wash it separately before wearing for the best experience.