Endura Baa Baa Merino L/S Base Layer

Best base layer

Scotland's Endura knows harsh weather, and it may have perfected next-to-skin gear with this supersoft, zero-itch merino wool that's thick enough to insulate without impeding your movements. It's highly breathable, too, wicking away sweat to keep you not just warm in the cold, but cool when you would otherwise overheat. [$70; endurasport.com]