Smartwool updated the fit of the Men's Classic Thermal Merino Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of the 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.

• Classic 100% thermal merino
  
• Slim Fit intended to follow the contours of the body
  
• Moisture management
  
• Temperature regulation
  
• Odor resistance 
  
• Merino wool with interlock knit for comfort
  
• Flatlock seam construction 
  
• Offset shoulder and side seams minimize chafing
  
• Side seams wrap to front
  
• Size medium center-front zipper: 10" (25 cm)
• Made in Vietnam
  
• 100% Wool-Merino, exclusive of decoration