Minus33 Merino Wool Tarleton Lightweight Short Sleeve 1/4 Zip 100% Merino Wool Imported QUALITY LIGHTWEIGHT BASELAYER: 100% Merino Wool designed to be "First-On-Last-Off" active wear. Easy care technology means your merino wool is machine washable and dryable. Your Minus33  zip t-shirt naturally wicks moisture and controls odor CRAFTED TO FIT: Sizes S to 3XL in a regular fit. Mock neck for maximum core warmth.  zip for adjustable venting. Outfitting anyone from the Hard-at-Work to the Hard-at-Play. Great for biking, hiking and kayaking 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 seams. Garment Weight Size Large = 6.4 oz. (181 grams). UPF Rating 25