As one of Smartwool's heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature regulated as you enjoy high-intensity skiing, hiking, running, and more.

• Slim
• 100% Merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation and odor resistance
• Flatlock seam construction and offset shoulder and side seams designed to increase comfort and minimize chafing
• Side seams wrap to front for body-enhancing fit
• 10' (25 cm) center-front zipper with semi-locking slider

Smartwool Classic Thermal Merino 1/4 Zip 2024