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Smartwool Men's Merino 150 Boxer Brief

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Every epic adventure starts with a solid foundation, and the last thing you want to overlook is the first layer you put on. Ultra-comfy Merino next to skin helps regulate body temperature, manages moisture and resists odors whether you're in Tennessee or Timbuktu. Features smooth, flatlock seams and a wide elastic waistband with Merino lining. Made from our ultra-soft and durable Merino 150 fabric.


  • Slim Fit; Mid Rise
  • Our lightest weight Merino jersey fabric uses a nylon core to increase durability while still keeping 100% Merino wool next to skin
  • Fully functional fly
  • Merino-covered elastic waistband
  • Flatlock seam construction designed to minimize chafing
  • Size M inseam: 4.75" (12 cm)
  • Black Marble Wash colorway features a plant-based dye technique
  • Knit in Vietnam: 87% Merino Wool, 13% Nylon Core. Exclusive of Decoration.


**This item is final sale and is not eligible for refund or exchange. This is regardless of packaging. Underwear can’t be resold for hygienic reasons.**

Size Chart
Product Details
  • Odor Control: Naturally antimicrobial. No Moisture build up, no bacteria growth...No odor!
  • Moisture Management: SmartWool fibers absorb and evaporate moisture in the vapor state so you stay drier, longer.
  • Temperature Regulation: SmartWool fibers maintain a more even body temperature for comfort in all conditions - cool when it's hot, warm with it's cool.
  • Washer & Dryer Friendly: No sweat to keep clean! SmartWool handles machine washing and drying while you rest away.
  • Slim Fit; Mid Rise
  • Fully functional fly
  • Wide elastic waistband (40 mm) designed for ultimate comfort; keeps Merino next to skin
  • Flatlock seam construction designed to eliminate chafing
  • Size M inseam: 6" (15 cm)
  • Knit in Vietnam: 87% Merino Wool, 13% Nylon Core
  • Garment Weight: 91 g = 3.2 oz
  • Style: SW014011

Easy Returns

For all eligible items, we will gladly accept the return or exchange of new items within 30 days of the original shipment date of product for a full refund.

Free Shipping

Free shipping on orders over $150! We use UPS and USPS, and send tracking info as soon as your order is shipped.

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Men's Merino 150 Boxer Brief

Men's Merino 150 Boxer Brief


Customer Reviews

Based on 1 review
Myles O'Neill
Patagonia Merino Wool boxer brief

Strongly recommend. These have been extremely comfortable. I have used these on my trek on El Camino de Santiago Compostela.