Icebreaker Siren Sweetheart

The Icebreaker Siren Sweetheart is a soft, stretchy long-sleeve merino wool shirt designed to sit comfortably close to the body. Its Corespun merino fabric combines natural warmth with flexible comfort, while helping regulate body temperature across changing conditions.

With its feminine sweetheart neckline and slim silhouette, it suits women looking for a versatile technical baselayer for active days outdoors, from snow sports and ski touring to running and everyday wear. The fabric feels soft against the skin while offering breathable, temperature-regulating performance.