100% MERINO FOR YOUR 100% SATISFACTION WHY IT'S SPECIAL: 100% merino wool with a steam finish that makes the fabric feel cooler next to skin Low profile saddle stitching and offset shoulder seams Natural moisture wicking, odor-resistant material. UPF 30. Custom Vintage Design screen printed in the USA with water-based inks GOOD TO KNOW: This isn't your basic merino, this is performance.