Men's Wool Base Layers
Classic Thermal
Merino Base Layers
- - Cool to cold weather
- - All activities
- - Sizes S-XXL
- - 250 g/m
Classic All-Season
Merino Base Layers
- - Cool to warm weather
- - All activities
- - Sizes S-XXL
- - 150 g/m
Intraknit™
Base Layers
- - Cool to cold weather
- - High intensity activities
- - Sizes S-XXL
Intraknit™
Base Layers
- - Cool to cold weather
- - High intensity activities
- - Sizes XS-XL
18 Products
New Colors
Men’s Merino Wool Base Layers
Start all adventures with Smartwool's collection of men's base layers. Designed for the dynamic man, our base layers are the foundation of comfort and performance in any condition. Crafted from the finest Merino wool, these pieces offer unparalleled warmth, breathability, and odor resistance, making them essential for anyone who refuses to let the weather dictate their day.
Our selection includes a variety of styles, from Men's Classic Thermal Merino Wool Base Layers for the coldest days to Men's Classic All-Season Merino Wool Base Layers perfect for active all-season pursuits. Dive into the future of comfort with our cutting-edge Intraknit™ Base Layers, which integrate mesh ventilation in key areas to keep you dry and comfortable, no matter the intensity of your activity.
From scaling peaks, hitting the trails, or simply seeking the best in everyday thermal comfort, our collection has you covered. Explore the versatility and durability of our best Merino Base Layers and experience why they are consistently ranked among the best merino wool base layers available.
Want to shop locally? Smartwool is sold across 5,000+ stores in the U.S. Find one near you with our Store Locator tool.
Men’s Merino Wool Base Layers FAQs
Q: Should base layers be tight?
A: Base layers should fit snugly without restricting movement. A close fit ensures optimal moisture wicking and warmth. However, they shouldn't be uncomfortably tight; the goal is a second-skin feel that moves with you.
Q: Are base layers and thermals the same?
A: Yes, base layers and thermals serve the same purpose—to keep you warm by trapping body heat and wicking away moisture. The term "base layer" is often used in outdoor and performance contexts, while "thermals" is more traditional. In some cases, the usage of “thermals” implies a heavyweight baselayer for colder temperatures.
Q: Can base layers be worn alone?
A: Our base layers are designed with aesthetics in mind, allowing them to be worn alone in milder conditions or when active. Their stylish designs and comfortable fit make them versatile for both outdoor adventures and everyday wear.
Your complete guide to Merino wool.
Naturally versatile, renewable, and totally comfortable. Learn more about Merino wool and all the benefits that come with wearing it for all your outdoor pursuits.
How to wash Merino wool.
We love Merino wool for its natural odor-resisting and moisture-managing abilities. Whether we’re running, biking, hiking trails, hunting, and skiing or snowboarding, Smartwool socks, base layers, and apparel help us keep us comfy and dry all day long.
Smartwool Size Chart
We want you to be 100% satisfied and comfortable with your Smartwool purchase. Our sock, clothing, and accessories size charts are specifically designed to help you find the best fit for men’s, women’s, and kids’ Smartwool products.
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