Smartwool | Men’s Active Boxer Brief

First-Layer Merino Comfort Built to Disappear

If your base layer is uncomfortable, your whole day goes sideways. The Smartwool Men’s Active Boxer Brief is engineered to entirely disappear under your clothing, whether you are logging high-mileage trail runs, grinding through a heavy gym session, or clocking a long shift on your feet. Combining the natural climate-control benefits of ZQ-certified Merino wool with the rugged durability of recycled polyester, these briefs rapidly pull sweat away from your skin, neutralize odors, and dry in a flash. It is the lightweight, premium foundation your active wardrobe demands.

Premium Performance & Everyday Features

• ZQ-Certified Merino Blend: Technical 150 g/m² knit structure delivers natural temperature regulation, elite moisture management, and natural odor resistance.
• Supportive Double Front Panel: Specialized dual-layer front contour adds extra structure, lift, and reliable hold during dynamic high-output movement.
• Chafing-Free Flatlock Seams: Low-profile, flat-stitched seams lay completely flat against your skin to banish friction and painful trail chafing.
• Wide Stay-Put Waistband: Soft, wide elastic waistband anchors firmly around your hips without digging in, rolling over, or binding.
• Ergonomic Slim Silhouette: Tailored slim fit contours to your body to ensure effortless layering under running shorts, hiking pants, or everyday denim.

Tech Specs & Care