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A soft and stretchy long sleeve T-shirt for everyday comfort and layering, the Siren Long Sleeve Sweetheart features a slim fit and Icebreaker's corespun merino wool blend fabric.
A soft and stretchy long sleeve T-shirt for everyday comfort and layering, the Siren Long Sleeve Sweetheart features a slim fit and Icebreaker's corespun merino wool blend fabric.
Icebreaker

Icebreaker Women's Merino 150 Siren LS Sweetheart Top in Undyed

$85.00
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With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritized (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or dispatch to you — it often never even hits the stock room shelves!

Prelaunch

With Prelaunch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Preorders.

So, instead, you can submit your email address for the item you are interested in, and we will email you as soon as stock arrives in the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indicative purposes only and can change at any time without notice.

The dates we provide are based on information given by our suppliers. Whenever we get updated information from our suppliers we will endeavor to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for dispatch to you or collection via Click & Collect on Undetermined

Icebreaker Women's Merino 150 Siren LS Sweetheart Top in Undyed

Brand:Icebreaker

Code:103194-000

The Siren Long Sleeve Sweetheart is a soft, stretchy T-shirt designed for everyday comfort and layering.

This long sleeve T-shirt features a slim fit and Icebreaker's corespun merino wool blend fabric. The Siren is a lightweight next-to-skin layer, crafted from 150gm merino jersey corespun fabric that is lighter than most other fabrics used by the brand. It is made with a snug, slim fit that works perfectly as a cozy piece beneath your other layers. Siren tees fit tighter than other tees in the Icebreaker range; you may size up if you prefer a looser fit.

Features:

  • Merino Corespun - merino blend regulates body temperature in all weather conditions.
Technical Information
  • Merino corespun
    Merino blend regulates body temperature in all weather conditions.
  • Style
    IB103194401
  • Product weight
    Small= 123 g / 4.33 oz
  • Good for
    Everyday
  • Fabric content
    83% Merino Wool/ 12% Nylon/ 5% Elastane, Exclusive of decoration
  • Warmth system
    150, 75, 150, 200, 260, 300, 460+
  • Merino fiber micron
    18.9µ, 15.5µ, 16.75µ, 18.9, 19.25µ, 20.5µ, 21.75µ, 23.0µ, 25.5µ
  • Fit
    Regular Fit, Slim
  • What makes it a Siren?
    The Siren is a lightweight next-to-skin layer. It’s crafted from 150gm merino jersey corespun fabric that’s lighter than most other fabrics we use, and is made with a snug, slim fit that works perfectly as a cosy piece beneath your other layers. Our Siren tees fit tighter than other tees in our range, just size up if you like a looser fit.
  • Free returns
    Extended free returns window through 1/31/26 for orders placed from 10/1/25-12/31/25.
  • Free ground shipping*
    Learn more
Sizing Information
Professional Opinion
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