Icebreaker Women's 300 MerinoFine Polar LS Half Zip

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The 300 MerinoFine Polar LS Half Zip is a heavyweight base layer top to keep you warm during the coldest of days. It features exceptionally soft, 15.5-micron fibres of 100% pure Merino wool for a premium next-to-skin feel plus a half zip for ventilation options and thumb loops for added protection from the elements. Naturally breathable and odour resistant.


  • Slim fit
  • MerinoFine™: 100% Ultrafine Luxury Merino, exceptionally soft 15.5 micron fibres that regulate body temperature in all weather conditions and naturally resist odour
  • Half zip for ventilation
  • Zip chin guard to prevent friction
  • Thumbloops keep sleeves anchored for extra protection and easy layering
  • Flatlock seams prevent friction
  • Drop-tail hem for extra coverage
  • Machine washable


Made From 100% Merino wool, 15.5 micron, exclusive of decoration

Merino wool is super lightweight, soft, moisture-wicking, non-itchy, non-clammy, warm in the cold and cool in the heat, and has a miraculous ability to resist odour. Because it was made in the mountains rather than in a petrochemical laboratory. It's naturally renewable, recyclable and biodegradable.

The smaller the micron, the finer the fibre, the softer it feels. The diameter of a Merino fibre is measured in microns – where one micron equals one millionth of a metre. Icebreaker's Merino fibres range from 15.5 to 23.5 microns to ensure a soft hand feel across our skin to outer layers. Finer fibres feel softer because they bend more easily when in contact with the skin.

  • Icebreaker next-to-skin layers: 15.5-18.5 micron
  • Icebreaker mid layers: 18.6-22.5 micron
  • Icebreaker outer layers: 22.6-23 micron
  • Synthetic fibres: 30 micron
  • Traditional wool fibre: 50 micron
  • Human hair: 70 micron

Machine wash cold (30°C), delicate cycle. Wash with like colours. Do not use softeners, do not use bleach. Dry flat in the shade, do not tumble dry. Cool iron. Do not dry clean. Exact instructions on the care label.


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