Lightweight and versatile layeringwear it as a baselayer a superlight midlayer or a jersey during active sports the natural odour resistance of merino wool ensures you can wear it for several days between washes so when you pack for your next active vacation the everyday half zip lets you get more use out of less clothing making for a lighter pack what39s not to love why icebreaker merinothe merino is an ancient breed of alpine sheep over millions of years they evolved a superfine h