Smartwool Merino Boxer Boxed Thermal Underwear - Black, XL

For those who demand more from their base layer, the Smartwool Merino Boxer Boxed redefines everyday comfort with the natural performance of Merino wool. Unlike ordinary synthetic underwear that traps odor and moisture, these boxers keep you fresh, dry, and at the perfect temperature from morning commute to evening workout.

Highlights

• 87% Merino wool, 13% nylon core-spun fabric for durability and next-to-skin softness
• Naturally odor-resistant and moisture-wicking—stay fresh all day
• Flatlock seams prevent chafing during movement
• Functional fly and Merino-lined elastic waistband for a secure, comfortable fit
• UPF 20+ sun protection for outdoor activities

In daily use

Slip into the Smartwool Merino Boxer Boxed and feel the difference of temperature-regulating Merino wool. The slim fit and 6.5-inch inseam provide coverage without bulk, while the breathable 150 g/m² fabric keeps you cool in summer and warm in winter. Whether you're hiking, traveling, or sitting at a desk, these boxers move with you and resist wrinkles and odors—even after multiple wears.

Full specifications

• Material: 87% Merino wool, 13% nylon (core spun)
• Fabric weight: 150 g/m²
• Fit: Slim
• Inseam: 6.5 inches (16.5 cm)
• Waistband: Elastic, Merino-lined
• Seams: Flatlock
• Fly: Functional
• Odor resistance: Yes (natural Merino property)
• Moisture wicking: Yes
• Temperature regulation: Yes
• Breathability: High
• UPF rating: 20+
• Care: Machine wash cold, gentle cycle; tumble dry low
• Gender: Men's
• Size: XL
• Colour: Black
• Intended use: Base layer, everyday wear, activewear

Final note

Smartwool's Merino Boxer Boxed is the underwear you'll reach for every day—combining technical performance with unmatched comfort, so you can focus on what's ahead.