There's no better material for technical layering pieces than merino wool. Full stop. Plenty of other fancy fabrics from laboratories make for excellent active garments, but the warmth, breathability, moisture wicking properties, and plain old soft-on-the-skin comfort of merino remain unbeaten. The Kari Traa Rose Hoodie is made of 100% merino wool with flatlock seams and a slim fit for maximum layerability in the resort and the backcountry, plus a lined hood for extra warmth on the chilliest of days.