Icebreaker Women's Siren L/S Sweetheart Merino base layer (XL, grey) - It has a feminine fit with a nice V-neckline. The Women's Siren L/S Sweetheart from Icebreaker! This long-sleeve consists of merino wool with a small synthetic fibre component. It has the outstanding comfort of merino with improved durability. The soft fabric feels light on your skin and is very soft, scratch-free, and breathable! Even during high exertion and sweat, the natural properties of merino wool prevent uncomfortable excessive cooling. Awesome! Since Icebreaker gave the Women's Siren L/S Sweetheart a stylish design, you can show it off in everyday settings, too!