The 6 Best Base Layers in 2024 – Long-Sleeve Running​ Shirts

Staying comfortable while running in the cold is all about layering. These are the best base layers from Patagonia, Smartwool, and more.

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Merino 260 Tech Long Sleeve Crewe Thermal Top - Icebreaker (US)

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Treeline Men's Base Layer Long Sleeve

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