Polar Max Men's Core 4.0 Zip Mock Tee 100% Other Fibers Made in US Heavy-weight body form fitting base layer. Ideal for coldest to extreme conditions Polar Max acclimate Dry performance for superior moisture-wicking/Quick drying Acclimate fresh/antimicrobial protection kills odor causing bacteria 100% USA made Body form fit-no Bulk. 90% Acclimate Dry Polyester/10% Spandex