Our bestselling 72-Hour Collection is woven from a super-soft merino wool blend that takes advantage of the material's all-natural performance, while also boasting long-lasting durability and machine-washable convenience. This high-performance shirt is perfect for adventures that call for packing light and staying comfortable. Even after 72+ hours of constant wear, it’ll still look on-point and pass the "sniff test" thanks to the naturally odor-resistant and moisture-wicking properties. Features Engineered fabric harnesses the incredible natural properties of merino wool to wick moisture, resist odors, and regulate temperature Nylon reinforcement allows the merino fabric to be machine washed for easy care throughout the life of the garment—just stick with cold/gentle washing to avoid shrinking Rated UPF 30+ for sun protection