Base Layers & Fleece
Merino, synthetics and fleece for smart layering.
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Best OverallSmartwool
Smartwool Classic Thermal Merino 250
100% merino, 250-weight warmth, zero itch. The base layer our testers reach for from October through April.
$1104.7
Best FleecePatagonia
Patagonia R1 Air Full-Zip
A breathable zig-zag fleece that insulates on the climb without cooking you — the active layer that replaced three others in our kit.
$1794.6