Whether worn as a warm mid layer on fall trail runs or as a heavier weight base layer on cold days of skiing, the women’s Vertex long sleeve half zip icon fair isle is a versatile favorite. Made from warm, stretchy and incredibly soft midweight 260gm, 100 percent Merino wool, the Vertex half-zip design lets you easily adjust to changing temperatures. The secure Zippered arm pocket stashes your ski PASS and other small items, while offset, flat lock seams prevent chafing when you’re wearing a pack.