Icebreaker Women's Merino 125 ZoneKnit LS Half Zip

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The Merino 125 ZoneKnit™ LS Half Zip is an ultralight base-layer top designed to help regulate body temperature during everyday training and other high-intensity adventures. It features Cool-Lite™, a TENCEL™/Merino wool blend fabric, to wick moisture and resist odours and body-mapping technology that places panels of eyelet mesh where you need it most. Other features include a half zip for extra ventilation, thumb loops and a drop tail for added coverage and flatlocked stitching for comfort.


  • Slim fit
  • ZoneKnit™: engineered body mapped technology to regulate your body temperature and let your skin breathe during high-intensity activity
  • Cool-Lite™: a lightweight and breathable fabric blend designed to help keep you cool
  • Raglan-sleeve construction
  • Eyelet mesh in strategically zoned panels for ventilation
  • Half zip for added ventilation options
  • Underarm panel for mobility and comfort
  • Thumb loops keep your sleeves anchored for extra protection and easy layering
  • Flatlock seams prevent friction
  • Drop-tail hem for added coverage


Made From Cool-Lite™: 60% TENCEL™ lyocell, 40% Merino wool, 18.9 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.

ZoneKnit™: is a body-mapped knitting technology that features different types of fabrics and technologies in the one garment to create warmth and ventilation in the places you need them most to optimise all-day comfort and built-in stretch so you can move freely. Naturally breathable and odour resistant.

Cool-Lite™ combines Merino wool and TENCEL™, a natural fibre sourced from sustainable eucalyptus plantations, so bringing together two natural, low environmental impact fibres. The high natural moisture content of TENCEL™ keeps you cool in the heat yet remains dry to the touch and is 60-70% cooler than Merino wool alone, as well as having exceptional wicking abilities (50% more moisture absorbed than cotton and dries twice as fast as polyester). The Merino wool component resists odour, breathes, and regulates temperature when it turns cooler. Defeat the heat in comfort.

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 on a gentle cycle. Wash with like colours. Do not use softeners, do not use bleach. Line dry in the shade, do not tumble dry. Cool iron. Do not dry clean. Exact instructions on the care label.


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