Best Heavyweight Base Layers for Men of 2026

Stay warm and comfortable all day with the Merino.tech Base Layer Set. This set includes a mens merino wool top and long johns, made from 100% Superfine 17.5 Micron merino wool. The midweight fabric provides the perfect balance between warmth and breathability, making it ideal for daily wear. The merino wool material is super soft and comfortable, ensuring no itch or discomfort. It also has natural moisture-wicking and odor-resistant properties, keeping you dry and fresh. With its exceptional customer care and 60-day limited warranty, you can enjoy this base layer set with confidence. Stay cozy and stylish with the Merino.tech Base Layer Set.

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 comfortable and dry during your outdoor adventures with the Carhartt Force Base Layer Top. This heavyweight crewneck top is built with Force technology, which wicks away sweat and dries fast, keeping you dry and comfortable throughout the day. The drirelease yarns provide excellent moisture management, ensuring that you stay cool and dry even during intense physical activities. The Rugged Flex design allows for unrestricted movement, while the strategically placed flatlock seams reduce chafing for added comfort. The concealed thumb loop ensures a secure fit and added convenience. With its tagless labels and odor-fighting properties, this base layer top is a reliable choice for all your outdoor activities.

The Cuddl Duds Thermal Set is designed to keep you warm and comfortable in cold weather. Its cozy brushed fleece interior traps heat while the soft exterior feels great against your skin. The fabric wicks away moisture, helping you stay dry and comfortable during activity. Thanks to the spandex stretch, you get a snug fit that moves with you, making it easy to stay active. Plus, the set offers extra protection with a thumbhole sleeve and a functional fly, making it convenient and versatile as a base layer under your winter clothes.

The Merino.tech Wool Half Zip offers you a range of weight options—from lightweight to heavyweight—so you can choose the perfect warmth for your activity and weather. Made from 100% superfine merino wool, this sweater feels soft and comfortable against your skin, avoiding the itchiness often found with wool garments. Its natural moisture-wicking ability keeps you dry by pulling sweat away, which is great for staying fresh during active days. Plus, it’s easy to care for, being machine washable, and naturally regulates your body temperature, making it a versatile choice for year-round comfort.

The Access Heavyweight Thermal Shirt is designed to keep you warm and comfortable during colder days. Its durable waffle knit fabric stands up to daily use and washing without losing shape, making it a reliable option for work or outdoor activities. The ribbed collar and fitted wrist cuffs help trap heat, so you stay cozy without feeling bulky. Plus, the slightly longer sleeves prevent bunching and ensure a secure fit, giving you freedom of movement whether you're stretching or layering. Made from shrink-resistant fabric with a bit of stretch, this shirt balances structure and comfort for all-day wear without sagging or stiffness.

The FORVEVO Merino Wool Thermals offer a cozy and practical solution for cold weather. Made from 100% high-quality merino wool, this base layer set includes a long-sleeve top and leggings designed to keep you warm without causing static cling. The soft and breathable fabric fits comfortably against your skin, so you won’t experience any itching or irritation during wear. Thanks to its moisture-wicking ability, the set helps keep you dry by pulling sweat away from your body, while the natural odor resistance keeps you feeling fresh throughout the day. For best care, hand wash in cold water to maintain the softness and warmth of the wool.

The MERIWOOL Heavyweight Wool Shirt is designed to keep you warm and comfortable in cold to freezing conditions. Made from 100% superfine 18.5-micron Merino wool, this shirt offers a soft, itch-free feel that you can wear all day without discomfort. Its heavyweight 400g fabric provides excellent insulation, making it ideal as a base or mid-layer during outdoor activities like hiking, skiing, or camping. Plus, it’s machine washable and dryer safe, so you can easily care for it after your adventures. With natural moisture-wicking and odor-resistant properties, this shirt helps keep you dry and fresh no matter how active you are.

The Carhartt Force Base Layer is designed to keep you comfortable during active days. Its Force technology helps pull sweat away from your skin, so you stay dry and fresh even during intense activities. The slim fit ensures the pants move with you, providing comfort without restriction. Breathable paneling lets air flow to prevent overheating, making it easier to stay cool. Plus, this base layer fights odor, so you can wear it longer without worrying about smells. Thoughtful seam placement also reduces irritation, letting you focus on your tasks without distraction.

The Fruit of the Loom Thermal Set is designed to keep you warm with its thick, brushed-back fleece fabric that feels soft against your skin. It helps pull moisture away from your body, so you stay dry even when the weather is freezing. The set includes a gusset seam, which adds flexibility, making it easier for you to move comfortably throughout the day. Plus, it has a tag-free design, which means no itchy tags to irritate your skin, giving you a smooth and comfortable fit all day long. This base layer is perfect for staying cozy and comfortable in cold conditions.