Stay protected in extreme conditions with SUBZERO Black 6404 thermal underwear, engineered for temperatures from -35°C to -5°C. Designed as a high-performance base layer, it traps body heat while efficiently wicking away moisture to keep you warm and dry. The fleece Waffle-knit technology, hypoallergenic material, and flat seams ensure maximum comfort, while the zippered high collar adds extra protection against harsh winter winds.
 
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