"Active 3-season warmth starts with the Columbia Midweight Stretch Long-Sleeve Baselayer Shirt. Crafted from 85% polyester/15% elastane stretch jersey, this crew top conserves heat close to the body when worn as a base layer thanks to a Omni-Heat thermal reflective lining. Ergonomic seams, flat-locked construction, and 4-way stretch delivers a comfortable contoured fit ready to move with you. Omni-Wick technology ensures superior moisture wicking to speed drying. Odor-fighting treatment on this Columbia base-layer shirt protects against bacterial growth to keep it fresh longer. Center back length: 26"". Machine wash. Imported.Manufacturer style #: 1639021. 85% polyester/15% elastane stretch jersey Omni-Heat thermal reflective lining Ergonomic seams Flat-locked construction 4-way stretch Omni-Wick technology ensures superior moisture wicking Odor-fighting treatment"