When you think base layers, you think Craft. That's how it made its name, and the Sleeveless Active Crewneck Base Layer has long been our first step in dressing for cold weather. Make no mistake, this is virtually universal: cycling, skiing, running, walking, enjoying a slow winter morning by the fire it handles every situation with the right amount of insulation on your torso alone so the cold doesn't handle your core. Craft's Active base layer line uses Active C130, the material formerly known as the proZero. Its venerable construction incorporates two polyester fibers that insulate and keep careful watch over moisture. The inner layer pulls sweat from your skin, and its fast drying properties benefit from the outer layer's help, which is spun yarn that provides another layer of wicking to keep moisture out. The whole thing features air channels that create pockets of warm air in a way that mimics the insulating behavior of merino wool. Base layers perform their best when they wear like a second skin, so Craft uses flatlock stitching and eliminates seams on the torso to ensure a form hugging but irritant free fit. The Men's Sleeveless Craft Active Crewneck Base Layer is available in five sizes ranging from Small to XX Large in the color Grey.