Icebreaker Women's Siren Cami Merino base layer (S, blue) - Super lightweight and soft - the perfect base for outdoor activities and everyday wear! The Women's Siren Cami from Icebreaker offers both the comfort and quick-drying properties of merino wool! For Icebreaker has spun the merino wool around a synthetic core, making the functional fabric even stronger. The length of the straps can be adjusted, making for an excellent fit. Thanks to its nice neckline, you can sport the top on hot days as well!