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.
Our three different fits - slim, regular, and relaxed - ensure that when worn together, layers move and breathe like a single garment.
A snug, close-to-body fit for low bulk layering.
Neither snug nor loose - garments that are worn solo or over other layers.
Loose fitting lightweight layers.
free returns & exchanges
A midweight baselayer zip shirt with optimized venting zones for active performance, the Men’s Winter Zone Long Sleeve Half Zip is a technical top for highly active days in cold conditions. Fully functional for warmth, ventilation, and support while alpine climbing, backcountry skiing, or other day-long adventures in the wild, the body features 260gm merino wool fabric with a touch of LYCRA® for stretch and a deep front zip for easy heat dumping. In the underarm panels we used lightweight, 180gm eyelet merino mesh that actively controls temperature during high-output pursuits, and in the higher-wear areas around the elbows and forearms we added 230gm merino and polyester waffle jersey for added abrasion resistance. Flatlock seams throughout eliminate chafing during fast-paced days.
Machine wash. Dries fast in the shade, but do not tumble dry. Exact instructions on the care label.
Shipping And Returns
Free Shipping On Orders Over $49
Free Returns & Exchanges
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Made to perform.
Icebreaker BodyfitZONE™ base layers employ our most advanced temperature-regulating natural technology. Soft and odor-resistant merino is used in different fabric forms to trap heat where it’s needed and release it when working at high intensities.
Heat dumping zones
Heat retention zones
Engineered to move freely
Merino fiber wrapped around a nylon core for strength.
Eyelet zones target the body’s ventilation needs during high physical activity.