QUALITY LIGHTWEIGHT BASELAYER: 100% Merino Wool designed to be your First-On-Last-Off extreme comfort quality active wear. These boxer briefs will keep you cool and dry while providing the support and comfort you need. ENVIRONMENTALLY FRIENDLY: The best in easy care technology means your merino wool is machine washable and dryable. Our 100% Merino Wool is a renewable fabric. Its moisture-wicking properties mean you won't have to wash it as often so you'll use even less water. CRAFTED TO FIT: Sizes XS to 4XL in a regurlar fit. Minus33 offers a great size and color selection. Outfitting anyone from the active athlete to the comfortable couch-potato. EXPERIENCED BRAND: Although there are many copy-cats on the market today, Minus33 has been a trusted brand since 2004. IMPORTED: As the legacy of a 100+ year old USA based woolen company, Minus33 knows quality and comfort in Merino Wool. We are committed to bringing you the best Merino Wool products at a reasonable price. TECHNICAL DETAILS: 100% 17.5 Micron Merino Wool 170 g/m2 Jersey knit construction with flatlock seam. Garment Weight Size Large = 3.5 oz. (100 grams). UPF Rating 49