SMARTWOOL MEN'S INTRAKNIT THERMAL MAX MERINO BASE LAYER 1/4 ZIP - WINTER MOSS

This top is a high-performance base layer designed for very cold conditions and high intensity winter activity. It uses Smartwool’s Intraknit™ construction which integrates insulation, ventilation and articulated movement zones into one knit garment. The Winter Moss colour gives a rich, muted green aesthetic suited for outdoor use or layering in colder weather.

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Materials & Construction

• Fabric is 100% Merino wool yarn (women’s version) for premium natural warmth, breathability, moisture management and odor control.

• Intraknit™ technology: The knit structure includes insulating terry-loop zones and mesh ventilation zones knitted seamlessly into the garment to provide warmth where needed and airflow where needed. 

• 3D-mapping and articulated fit zones: Designed to allow freedom of movement and comfortable fit under layers or by itself. 

• Quarter-zip front panel (approximately 21 cm / 8.25" centre front zipper) for easy venting and pull-on/off. 

• Slim fit: Designed to follow the contours of the body for layering performance rather than loose casual wear. 

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Warmth, Fit & Use Case

• The Thermal Max line is rated for cold conditions (for example < 25 °F / < -4 °C) thanks to the 100% merino and knit-structure design.

• Ideal for activities such as winter hiking, skiing/snowboarding base layer, cold-weather running or any high-output movement in cold settings.

• Because of the slim fit and high-performance build, it works well under shells, insulated jackets or alone in very cold dry weather.

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Benefits

• Excellent moisture regulation and odor control due to 100% merino wool.

• Integrated insulation plus ventilation zones mean you stay warm without overheating during movement or transitions.

• Quarter-zip allows you to vent when your body warms up and close when you’re resting or in cold wind.

• Slim, articulated fit helps keep the layering minimal bulk while providing warmth.

• Stylish colour (Winter Moss) makes it viable for both outdoor performance and casual winter layering.

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Considerations

• Being a heavy base layer built for cold, this may feel too warm or restrictive for milder conditions or low intensity use.

• Slim fit means less room for bulky layering underneath; if you plan thick mid-layers you may want to size accordingly.

• For extremely wet conditions (rain, heavy wet snow) you’ll still need a shell/top layer on top—this is a base layer, not a waterproof outer.

• Merino wool garments require a bit more care than synthetic base layers—gentle wash cycles, avoid high heat drying for longevity.