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$28.80 - $50.00
$48.00 - $50.00
-40%
$28.80 - $50.00
$28.80 - $48.00
-40%
$21.00 - $40.00
$35.00 - $40.00
-40%
$52.00
$30.00
Upgrade your essentials with Smartwool’s collection of men's underwear, designed to provide unmatched comfort, support, and performance. Crafted from high-quality Merino wool, our underwear is perfect for active lifestyles and everyday wear, offering the best in breathability, moisture management, and odor resistance.
Our boxer briefs are a standout choice, combining the softness and natural benefits of Merino wool with a supportive fit. These boxer briefs are ideal for any activity, from intense workouts to lounging at home. The quick-drying properties of Merino wool keep you dry, while its temperature-regulating abilities ensure you stay comfortable in any climate. These briefs are designed to move with you, offering flexibility and support for all-day wear. The natural elasticity of Merino wool ensures a snug fit that stays in place, reducing the risk of chafing and irritation.
Our Merino wool underwear collection also includes a variety of styles to suit different preferences and needs. Whether you’re looking for boxers, briefs, or base layers, our Merino wool options provide exceptional comfort and performance while being high-quality and sustainably made.
Want to shop locally? Smartwool is sold across 5,000+ stores in the U.S. Find one near you with our Store Locator tool.
Q: How to wash Merino wool underwear?
A: Machine wash on a gentle cycle with mild detergent and lay flat to dry. Avoid fabric softeners and bleach to maintain the quality and longevity of your underwear. See more instructions on how to wash and care for Merino wool here.
Q: How fast does Merino wool underwear dry?
A: Merino wool underwear dries relatively quickly due to its natural moisture management properties, typically drying faster than cotton. For best results, lay it flat to dry in a well-ventilated area.
Q: What are the benefits of Merino wool underwear for men?
A: Merino wool underwear offers excellent moisture management, odor resistance, and breathability, ensuring you stay comfortable and fresh all day long.
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.
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.
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.
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.
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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