Icebreaker Womens Siren Long Sleeve Sweetheart Tee

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The Women's Siren Long Sleeve Sweetheart Tee from Icebreaker is a low bulk base layer that is ideal for all seasons. Perfect to wear alone in warmer conditions or to use as underwear in colder climates, it is close fitting to ensure it can easily be layered. The sweetheart neckline makes it discreet under other clothing while offering a flattering shape when worn alone. The Corespun fabric combines the durability of nylon with the softness and natural odour resistance of Merino wool to offer the best in comfortable base layers that you can wear all day long.

  • Fabric: Corespun (83% Merino wool, 12% nylon, 5% lycra, 150g/m2)
  • Sweetheart neckline
  • Long sleeves
  • Durable
  • Low bulk for easy layering
Product Code: A4924585
Three people walking next to water.

Nature created Icebreaker merino wool as protection against the scorching summers and freezing winters of New Zealand’s rugged Southern Alps mountain range. The merino is one of the world’s most ancient and toughest breeds of sheep.


Icebreaker has pioneered the use of merino wool in the wilderness since 1994, and have now fused nature and technology to create merino layers for the outdoors, for performance sports, and for the city. Icebreaker merino garments are soft and non-itch, warm in the cold and cool in the heat, they breathe to prevent clamminess, and have a miraculous ability to warn off stinkiness.