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

On cold days, Merino wool keeps you warm, dry, and stink-free. These base layers—from Smartwool, Tracksmith, and other trusted brands—are great for runners.

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The Best Men's Base Layers of 2024

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Smartwool - Women's Thermal Merino Base Layer Pattern 1/4 Zip Plus - Running Lab

Merino 200 Oasis Long Sleeve Crewe Thermal Top - Icebreaker (US)

Best Baselayers of 2024

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The 8 Best Base Layers of 2024

This One Simple Base Layer Transformed My Winter Running

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.

Smartwool Classic Thermal Merino Base Layer Men's 1/4 Zip Black Color Shift / XL

Best Winter Running Gear: 2024