Smartwool Intraknit Men's Thermal Boxer Briefs XL Black

Cold-weather activities demand base layers that manage moisture, regulate temperature, and resist odor without adding bulk. These Smartwool Intraknit boxer briefs solve that problem with a targeted blend of ZQ-certified merino wool and polyester, delivering all-day comfort for skiing, hiking, or everyday wear.

Who is it for

Men who need reliable thermal underwear for high-output winter sports or cool-weather commuting. The slim fit and virtually seamless construction make them ideal under mid-layers or trousers, while the functional fly and wide elastic waistband ensure convenience and a secure fit.

Main features

• Intraknit™ technology integrates body-mapped mesh zones for enhanced ventilation and moisture management.
• Merino-rich fabric (53% merino wool, 45% polyester, 2% elastane) naturally regulates temperature and resists odors.
• Virtually seamless toe-to-toe construction eliminates chafing and irritation during movement.
• Wide, elastic waistband with Smartwool branding keeps the briefs in place without digging in.
• Functional fly adds practicality for quick breaks.
• Quick-drying and breathable, with a fabric weight of 200 g/m² for year-round layering.

Specifications

• Product type: Boxer briefs
• Gender: Men's
• Size: XL
• Color: Black
• Material composition: 53% merino wool, 45% polyester, 2% elastane
• Fabric weight: 200 g/m²
• Fit: Slim fit
• Technology: Intraknit™
• Seam construction: Virtually seamless
• Waistband: Wide, elastic, Smartwool branded
• Fly type: Functional fly
• Ventilation: Body-mapped mesh zones
• Key features: Moisture-wicking, temperature regulating, odor resistant, breathable, quick-drying
• Intended use: Base layer, activewear, everyday comfort
• Wool source: ZQ-certified merino wool
• Care instructions: Machine wash cold, gentle cycle; tumble dry low; do not bleach; cool iron as needed; do not dry clean

Tips

For best results, wash inside out with similar colors and avoid fabric softeners, which can coat merino fibers and reduce performance. Pair with Smartwool Intraknit tops for a complete moisture-managing base layer system.