evo.com | Smartwool Long Underwear Tops > Finally, a layer that is not too hot, not too cold, and is plenty comfortable for use in a wide range of activities. Mesh ventilation helps you dump heat when you start to earn yourself a sweat, and the naturally odor-resistant merino construction helps you feel more confident for full days of getting after it. Mesh Ventilation Seamlessly Knit In Gender-Specific Zones Designed to Keep the Body Dry and Comfortable Merino Sport | 50% Merino Wool / 50% Polyester Merino Sport yarn combines the power of Merino with the durability and fast dry times of polyester. Regular Fit Center Front Zipper Engineered Construction Uses Knit Structures to Enhance Performance with a Sophisticated Finish | Women's Smartwool Intraknit HyFi Pullover 2021 - Large Black | Wool/Polyester