Icebreaker 300 MerinoFine Polar Women's LS Half Zip

The Icebreaker 300 MerinoFine Polar Women's LS Half Zip is the brand's warmest merino base layer top, made for the coldest days. Ultrafine merino in a heavy, brushed knit delivers plush softness and serious warmth, with a half zip for on-demand venting. It is the deep-winter foundation top for skiers who chase the cold.

Why we like it:

The brushed polar interior is genuinely cozy; it traps a lot of warmth while the ultrafine MerinoFine wool feels soft against the skin. A half zip adds venting so the warmest base layer still breathes when you work.

Features and Functions:

The 300 MerinoFine Polar Half Zip uses a heavy 300 gram merino knit of ultrafine 15.5 micron MerinoFine fibers, brushed for a plush polar interior, with a half-zip collar. The natural wool insulates even when wet, wicks moisture, and resists odor.

Fit and Sizing:

A close fit sits against the skin and layers under a shell. True to size, cut for maximum warmth with easy venting.

Bottom Line:

As the warmest merino base layer top for deep cold, the 300 MerinoFine Polar Half Zip is best at maximum all-natural warmth with easy temperature control. The top to reach for on the coldest days.