Smartwool Classic Thermal Merino 1/4 Zip

Smartwool Classic Thermal Merino 1/4 Zip Review: Warmth Without the Weight for Cold-Season Missions

A True Winter Layer That Punches Above Its Weight The Smartwool Classic Thermal Merino 1/4 Zip isn’t your average base layer. It’s built from 100% Merino wool at 250 g/m², making it Smartwool’s warmest offering in the performance category. Rather than mimic synthetic technical layers with stretch panels and composite weaves, it sticks to its…

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