Meet the better-than-ever Smartwool® Classic Thermal Merino Base Layer Crew. This 100% Merino wool fan-favorite crew is updated with a new fit to improve functionality while enhancing aesthetics. Its shoulder panels eliminate top shoulder seams and a flatlock seam construction helps prevent chafing. This pullover base layer is designed with long sleeves, a crew neckline, and a straight hem. The Merino wool fabric is made with an interlock knit for comfort, breathability, thermo-regulation, and odor resistance. Its side seams are designed to help increase comfort and minimize chafing. Add one of our best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or biking.