The men’s Latitude Flex Base Layer keeps you warm – without losing high-performance function. Made with a merino blend and featuring a built-in balaclava (plus thumbholes to boot), this close-fitting pullover is the perfect base layer or standalone top for winter training. We added a front chest panel with wind-blocking fabric for more protection, and used a flatlock stitch throughout to reduce bulk (and eliminate chafing). Cold weather has met its match.