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

• Fit: Slim.
• Our slim fit is intended to follow the contours of the body.
• Fabric helps combine the moisture management, temperature regulation, and odor resistance of 100% Merino wool with interlock knit for comfort.
• Back body seam wraps to front.
• Raglan sleeves.
• Flatlock seam construction designed to help increase comfort and minimize chafing.