Icebreaker Women's Siren L/Sleeve Sweetheart Underwear - Snow

Size Guide
Size Guide Icebreaker Women's Tops

Measure Yourself:

Use the chart below to determine your size. If you're between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit. If your measurements for chest and waist correspond to two different sizes, order the size indicated by your chest measurement for tops and your hip measurement for pants.

How to measure yourself:

  • Arm Length: Measure from the back of your neck across the top of your shoulders to your elbow, and down to your waist.
  • Bust: Measure under your arms around the fullest part of your bust.
  • Waist: Place the measuring tape at your natural waist, the narrowest part on your torso.
  • Hips: Measure around the fullest part of your hips.
Bust Arm Length Waist Hips
X-Small (cm) 76-82 77-77.5 58-64 84-90
X-Small (in) 30-32 30.25-30.5 24-26 34-36
Small (cm) 82-88 77.5-78 64-70 90-96
Small (in) 32-34 30.5-30.75 26-28 36-38
Medium (cm) 88-94 78-78.5 70-76 96-102
Medium (in) 34-37 30.75-31 28-30 38-40
Large (cm) 94-100 78.5-79 76-82 102-107
Large (in) 37-40 31-31.25 30-32 40-42
X-Large (cm) 100-107 79-79.5 82-89 107-113
X-Large (in) 40-42 31.25-31.5 32-35 42-44


Fit Guide:

Icebreaker have three different fits - slim, regular, and relaxed - ensure that when worn together, layers move and breathe like a single garment.

  • Slim Fit - A snug, close to body fit for low bulk layering.
  • Regular Fit - Neither snug nor loose - garments that are worn solo or over other layers.
  • Relaxed Fit - Loose fitting lightweight layers.

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An elegant, year-round under-top for women on-the-go.

The lightweight Siren is constructed from a beautiful 150gm jersey merino wool and a touch of LYCRA for spectacular stretch & comfort. The breathable Siren not only looks great on you, but also offers unrivalled temperature regulation - cooling you whilst you are hot, and insulating when cold. A unique sweetheart neckline adds a feminine touch, while the set-in sleeves and self binding fabric at the neck ensures that you are comfortable when you're active or running errands around town. The merino fabric naturally regulates temperature, manages moisture and resists odour - so that you can wear your Siren underwear comfortably for multiple days without washing.

  • The merino wool/lycra blend offers great stretch & comfort, temperature regulation and odour resistance.
  • A sweetheart neckline adds a feminine touch, while set-in sleeves and self binding fabric at the neck provide comfort.
  • The Siren excels in both hot & cold climates.
  • 96% merino wool, 4% LYCRA.
  • 134 g / 4.73 oz.
  • Slim fit.