Smartwool TML Half Zip - Women's: The TML (Thermal Midlayer) Light SportKnit 1/ Zip goes over your SmartWool base layer. As your base layer begins the breathing process, the midlayer keeps moisture moving while trapping air in its fibers, adding warmth without bulk. Includes a rubber tip zipper pull and thumbholes. Form-fitting. Made in China of Merino wool.

 Moves perspiration in a vapor state while trapping warm air

95% Merino Wool
4% Nylon
1% Elastic