Polarmax Women’s Montana Wool 2.0 Zip Mock is a nice blend zip that is 50% Merino Wool and 50% Acclimate Dry Polyester that is a more relaxed fitting zip. The merino wool used is sheered from sheep raised here in America. Moisture-wicking, Quick-drying, and containing an Acclimate Fresh Anti-Microbial it is a great Merino Wool that can be a nice addition to your daily wear collection.