Shop men’s base layers designed by Smartwool® to help regulate temperature, manage moisture, and provide breathable comfort in any condition. Crafted with the finest Merino wool, these pieces offer unparalleled comfort, breathability, and odor resistance, making them essential for performance and everyday wear. These men’s base layers are built as the foundation of any layering system, helping you stay dry and comfortable in changing conditions.
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. Choose from all-season and thermal base layers designed for different conditions and activity levels. Dive into the future of comfort with our cutting-edge Intraknit™ Base Layers, which integrate mesh ventilation in key areas to help manage moisture and keep you 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 men’s base layers and experience why they are consistently ranked among the best men's base layers for Merino performance. Shop men’s base layer tops, bottoms, and full sets designed for every condition.
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Free Return Policy Smartwool offers free returns within 30 days from the date of purchase. Items must be unused, unwashed, and unaltered.
Store Returns Return the unworn item(s) to the store where you originally made the purchase for a refund or exchange.
Online Returns Return unworn item(s) purchased at smartwool.com 30 days from the date of purchase for a complete refund. Initiate a return by accessing your order history and selecting “Return Items."
Refunds may take up to 3-5 weeks to process due to the time often required for shipping and bank processing. Exchanges are not available.
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Free Shipping
We are currently offering free shipping on orders $89+ placed on smartwool.com.
Shipping based on normal carrier restrictions and delays. We cannot guarantee arrival. Offer is valid for the continental US excluding Alaska, Hawaii, Puerto Rico and any US territories, as well as PO Box addresses. Delivery days are Monday-Friday, excluding US federal holidays. Free shipping may not be available for some customers.
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