evo.com | Smartwool Long Underwear Bottoms > Not all base layers blend in. The Smartwool Classic Thermal Merino Base Layer Colorblock Crew Top - Men's brings a fresh look to your winter layering system, combining 100% Merino warmth with breathable comfort that shines on cold days. Soft against the skin and ready for long hours outside, it's proof your first layer can have just as much personality as the rest of your kit. 100% Merino Wool Made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance. Slim Fit Smartwool's slim fit is intended to follow the contours of the body. Flatlock Seam Construction | Smartwool Classic Thermal Base Layer Colorblock Crew Top Men's 2027 - Large Black