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The Smartwool Intraknit Thermal Max is a men's merino base layer with a quarter zip, built for cold-weather training and active winter wear. Its Intraknit construction knits insulating terry loops and mesh venting into one seamless piece, with 3D-mapped tailoring for a body-skimming fit and knit-in reflective elements. The 8.25-inch front zip adds venting when you heat up. It suits skiers, runners and hikers who want warmth without bulk, though the athletic cut runs narrow, so many owners size up.
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Owners rate the Intraknit Thermal Max highly for warmth-to-weight, breathability and the near-custom fit. The most common complaint is sizing: the athletic cut is snug, and many buyers recommend going up a size.
This is a men's quarter-zip base layer for cold-weather activity. It uses Intraknit technology to combine insulation, articulation and ventilation in one seamless knit. Insulating terry loops sit where warmth is needed, and mesh panels vent the body to balance warmth and breathability.
The tailoring is 3D mapped for a close fit and freedom of movement. Merino yarns manage moisture, insulate, regulate temperature and control odor. Knit-in reflective elements are included, and an 8.25" (21 cm) center-front zipper adds extra venting when needed.
The fit is athletic and slim, meant to skim the body so it moves freely. It is cut narrow, and customers recommend sizing up.
