A U-Sixty Long Sleeve has endless applications. It looks good layered up for work. It fits in at a post-hike barbecue. It travels well, but is comfortable at home. That's because the U-Sixty is an uncomplicated piece: mid-weight, with a regular fit and a yoke detail at the center back. Like many Ibex favorites, they used a simple design so the most outstanding detail of the U-Sixty is the natural performance of Merino wool. Yoke detail at center back. Machine washable. Lightweight jersey. 18.5 micron. 100% New Zealand Merino wool. 150 g/m2. Made from superfine 18.5 micron New Zealand merino wool, the super soft, quick-drying, lightweight jersey fabric outperforms synthetics and cotton in warm conditions. Wool's natural temperature- regulating and moisture-managing properties give you next-to-skin comfort year-round. We use this fabric for warm weather tops and for baselayers in the cooler times of the year. Easy care, machine washable. 100% Merino Wool.