The 8 Best Merino Wool Base Layers in 2024 - Best Base Layers for Running

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The Smartwool Men's Merino 250 Base Layer 1/4 Zip has an updated fit to improve functionality while also enhancing aesthetics. As one of our 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.

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The 8 Best Merino Wool Base Layers in 2024 - Best Base Layers for Running

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