For demanding days chasing powder in the trees, we made theSpruces Mid-Weight Merino Baselayer Crew. Its do-it-all wool blend balances the temp-regulating comfort of merino with the durability of nylon-plus a touch of stretchy spandex thrown in for good measure. This baselayer top's moisture-wicking and odor-resistant performance comes in clutch when we're working hard-and playing even harder-in the backcountry for hours.