Smartwool Active Long Sleeve - Women's Clothing : Nightfall Blue : Get ready to break a serious sweat. This lightweight, super-soft Smartwool Active Long Sleeve is crafted from a blended fibers performance fabric to help you stay cool, dry, and comfortable through any and every movement. Featuring reflective elements, long sleeves, crew neckline, thumb holes at cuffs, and brand detailing on the back. ; 53% Merino wool, 47% TENCEL Lyocell. ; Machine washable. ; Imported. | Smartwool Active Long Sleeve Women's Clothing Nightfall Blue : SM, Lyocell/Wool